- To my sweet grandson, today you turn 15. What a beautiful day for this beautiful young man. I love you so much! Here’s to many more years of seeing your wonderful smile and hearing your sincere laugh. Happy birthday, my darling.
- I hope this upcoming 15th year of your life will be phenomenal and full of amazing surprises. May it be full of prosperity too! I wish nothing but utmost love, faith, and happiness for you. Happy birthday, my lovely grandson!
- Happy Birthday, my dear grandson! You’re getting so big and handsome too, I hope your day is filled with lots of fun just for you!
- When you were young, I used to help you to model different shapes out of clay. But now I can see you modeling different dreams and ambitions of your life into reality. You have grown up really fast. Happy birthday to my grandson.
- Happy birthday to our wonderful grandson. Congratulations on turning 15, have a great day
- Grandson, many times I wondered why you are so close to me. As you get older, I guessed that you need not be told that the meaning of life is not fame and fortune. To know what it feels like to be loved and make someone smile each day is all that matters. I am glad you are my grandson, and I wish you a happy 15th birthday filled with luck, love, and success!
- I am so proud of my only grandson! Today you have turned 15, and I think it is time to let you know the sacrifices your parents have made to make your life happy. They are the best parents in the world and I hope you will grow up to be as caring and loving as them. Happy birthday my dear!
- Happy 15th birthday to my grandson! You bring so much joy to everyone in the family. Thank you for being such a wonderful addition to our lives. Love you, Grandma.
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Birthday Wishes for 15 Year Old Grandson:
- Dear Grandson, you’re 15 years old now. You are no longer a baby to who I can carry in my arms or even tell stories. I hope you would make me proud by doing well in school and also making new friends. I know you will because you have always made us proud with your aptitude and fear of failure. Happy Birthday!
- Great age comes with responsibilities and maturity. As a 15 year old, you ought to understand the new world you’re slowly stepping into. Happy birthday, to my little grown up!
- It’s your birthday! You’re officially 15 years old today! We wish you great health, happiness, and great success in the future. Love you very much.
- Happy Birthday to you, a very special 15 year old boy. I know how big the world can be and today you become in charge of your own life. Now it is up to you where you go and what you do. I want to wish you all the best and whatever happens, if things don’t turn out as per your expectations, then it’s still better that you tried.
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