Happy 10th birthday! What a momentous day for you — you’ve officially joined the Double Digit Club. You’re in the BIG leagues now. Bravo!
Happy birthday. Wow, you’ve just turned 120 months. You don’t look a day over 119 months and 364 days!
To know a girl/boy like you has always made us so proud. My best wishes for you on your very special birthday!
You are the center of our world. We love you very much, kid. We are proud of you, daughter/son. Happy birthday to you!
You are batman and superman combined. Keep a piece of your birthday cake for us too!
Now that you’re 10, it’s time to get a job. Your first task is to have a good birthday, and I’ll pay you in cake.
After being ten, you shall now be known as a effective, younger good-looking/lovely gentleman/woman. You are now not a small youngster. Happy birthday!