You can’t be too old to celebrate the 10th birthday of your grandson and you should not be too young to send them messages on their birthday. It’s as simple as that. Though I’m going to recommend you check out these cute birthday wishes below to make his day.

Birthday Wishes For A 10 Year Old Grandson

1. Happy Birthday to a smart, amazing and wonderful grandson! You have brought great joy in my heart. I wish you the best as you celebrate your 10th birthday. Thank you for being the person I know you to be!
2. Hi dear son, I feel so lucky to have a handsome grandson like you. May you become a great man and continues to make the world better every day. Happy birthday!
3. Happy Birthday my little angel! You deserve this day filled with love and happiness, because you are the most adorable star I know. Be strong and do your best in every thing for today. You are a great kid; enjoy your day!
4. Your birthday is the best day of the year for a sweet kid like you! It’s about to be the best birthday of your life, because this year, you are going to hit it big! Yay! Happy Birthday, buddy!
5. Here’s to ten more years of good health, happiness, and success! I love you very much.
6. You’ve been such a good friend to your granddaddy. I’m so glad you two get along so well. I’m in awe of how grown up you are and the things you’re learning.
7. Birthday boy, I hope you have a good day. As you grow older, your body is also undergoing a transformation. Many changes are taking place, and the good things will fade quicker than the bad things! Nonetheless, you are still young and care free like most kids of this age. Happy birthday!
8. Happy birthday to you, my 10 year old grandson. May your 10th birthday be a gallon of bubbles and a day full of cheer!
9. Dear Josh, Happy 10th birthday! This must be one of the best days in your life. I would like to wish you a wonderful birthday filled with all the happiness that comes with being a 10 year old boy. I am happy to know you, and I hope my thoughts will bring you even more joy! Happy Birthday!
10. Happy Birthday My dear Son, May this day as special and memorable as you are! I am very proud of all the effort you put into achieving the position of being the best in my life. You are a treasure that is highly respected by me. You are a wonderful grandson and I am very blessed to be loved by such a special person.
11. Today is a very special day for you and I can’t wait to hear the great wishes I get in your cards.
12. I wish you the best in the year that you’ll turn 10. The future looks bright and filled with lots of activities. Your 10th birthday, is eagerly awaited by all who see you as a young man just on the cusp of his teenage years…
13. I hope your birthday brings you much happiness and all the gifts in the world. I wish you lots of fun, love and above all a very happy birthday!
14. Thank you for being the best grandson a girl could ever have. I hope that life is a breeze for you, and you always know how much you are loved by me and the entire family.
15. You’ve become a man and I’m proud of you. I can’t tell you how happy I am to see you succeed in your life at such a young age. XOXO
16. Today you have grown into a very handsome and responsible little lad. This special day is a blessing to me because I know that older, wiser men grow in wisdom and knowledge. So, I am sure you will be able to take on new responsibilities like a pro.
17. Wishing you an enjoyable day filled with fun and excitement. You are a handsome young man, and though I know you cannot present this to me, I hope it will be received as your birthday gift from your loving grandmother.
18. You are one in a million. With the help of numerous people, you will live a rich and successful life full of love, knowledge, and great memories. Happy 10 Year Old Birthday
19. Let’s celebrate together! Happy 10th Birthday! May your birthday be filled with happiness and joy. Wish you a very prosperous life, greater than the most of the people that surround you.
20. As I prepare to celebrate your special day, I find myself thinking how old you are already! And you’ve only just celebrated turning one-year-old! If you age at the rate of regressing every ten years, then at this rate, you’ll be a 50 year-old by the time your 10th birthday rolls around. But seriously, happy birthday to my special little boy! You’re a gift from life that I am so glad to receive.
21. Dear 10 year old grandson, I wish you the best of luck in all your endeavors. Your enthusiasm, positive attitude and eagerness to learn will always be the source of my inspiration. You are as yet untainted by all that life has thrown at you; it is high time you experienced the good, bad and ugly. You were given a bright future full of promise, So let us work together to make sure that the world knows how much we love you.
22. Happy birthday to my beautiful grandson! I am so happy that you are growing up and turning into a responsible young man. I hope you know the value of friendship and for being such a thoughtful little boy. I cannot wait to see what kind of man you will become, and professionally. Keep being yourself, you are my pride and joy.
23. It is great to have a grandson with such cheerful attitude and spirit. God bless you in every way!
24. Happy birthday dear Harry, we appreciate you for being the best grandpa in the whole world! On your special day, make sure to remember tomorrow’s gifts.
25. 10 to 11 year old boys are full of energy and life. They have an infectious zest for life, and you will relish the energy that a 10-year-old boy brings. Your birthday is your day to shine. You are a star in the making and it is time to let your light shine. I am glad that we have been blessed with such a wonderful grandson. Have fun!
26. Happy Birthday to the 10 year old boy who is a friend, a supporter and an inspiration. It would not be possible to survive 10 years of bad times without your support. Your love and care have helped us to live, dream and really thrive in life. You always have my back and I never worry about you when you go out!
27. I know those forgotten moments when we’d run and play together, but even more wonderful than the hours spent playing is knowing you are my son. May the Lord bless you with many more years of happiness on this your special day.
28. Today, you became a big boy? I hope your today is full of joy and happiness as it should be. You will become an even bigger man in the years to come, and with that comes responsibilities of your own. No one knows better how hard it is to make something out of nothing. The world can seem bleak at times, but do not believe it. One day, you will be strong enough and have all the tools at your disposal to help others who are less fortunate than you.
29. Happy 10th birthday! You are important in my life. I hope this day brings you lots of happiness and happiness.
30. We are happy that you have reached the age of 10 today. I hope you have a good day celebrating your birthday.
31. Happy birthday to you, my grandson, it’s hard to believe that your 10th birthday is coming round the corner! I am sure it will be an eventful one! I wish you a happy 10th birthday!
32. Today’s your birthday, young man! I wish you joy and happiness in your life…and a lot of other things too!
33. It’s my birthday, and I want you to have something special for your special day. Remember, it’s one day a year that is very special to know that you deserve the best. Happy Birthday darling!
34. Happy Birthday to my little nugget! I hope you have fun celebrating your special day. I know you love the day of birth and it’s all about family. We love you so much! I wish you a happy birthday.
35. Happy birthday dear Junior! Thank you for being my 10-year-old grandson. I am glad you are growing up into a smart, kind and honest kid. I will always be here for you when you need advice or help. Have a birthday you never forget.
36. On this special day, I wish you a squeal-worthy birthday. You are an extra-special birthday boy who loves the color red and his favorite saying is “Happy Birthday!”. Wishing you lots of loads of fun and loads of friends to play with. Always know that you will always have a good friend who will be there for you.
37. Happy Birthday to my beautiful grandson. I love you so much and I wish you a great day.
38. Hello, my dear Grandson! Today is your very special day, and I want to make it a wonderful one. It’s wonderful that you’re ten and just starting out in all areas of this life. I’m very good at appreciating things, so much so that I am grateful for everything I have! I wish you happiness and happiness for the rest of your life!
39. You’re only a young boy and you don’t know how much I ADORE you!!! Happy Birthday Dear!
40. Hi handsome! You are looking as beautifull as ever! Happy birthday to you! Please accept my wishes and have a great time on your special day.
41. Today is your birthday, and I hope it is one to remember. You are precious to me, and I will continue to be here for you as a great big daddy should. I love you with all my heart, Happy Birthday!
42. I wanted to wish you a happy birthday. You are my blood and in the few short years we have been together, I have watched you grow into an amazing young man! God has blessed us with the best of everything! Happy 10th Birthday Arriver!
43. Happy Birthday to my friend and brother, you are so kind and sweet. I am happy that God has blessed you with such a wonderful life. I wish you much happiness today, may your birthday be filled with good fortune and health in all ways!
44. I want to wish you a Happy Birthday! I wish you all the best in your new life as you have embraced it and made it your own. Thank you for bringing joy into my life and keeping me on the path to becoming a great person. The gift of hope is something no one can ever take away from you. Please know that I will always be here to help, guide, and support you in any way I can…
45. Happy birthday dear Charlie! Your generosity of spirit to me, others and this world is awesome. Thank you for giving me one more day each year. May we create wonderful memories forever together.
46. Dear Grandson, it is with great joy and pride that I wish you a wonderful birthday! It’s a privilege to be a part of your life and I am very lucky to have been able to celebrate the growing years with you. I know how much you have grown since you came into my life waiting for your first day of kindergarten. On this special day, I wish you many lovely things- happiness, joy, kindness, health and success. 
47. Dear grandson, today you are ten years old and growing like a little tree! I hope you will have many happy birthday to make up for all the ones you missed. Both of us would love to share your celebration in a joyful manner on a special day!

Also See: Birthday Wishes For A 10 Year Old Granddaughter