On your birthday I'd like to propose a toast to you. My life is better for knowing you and the world is a better place for having you in it for the past 50 years. Cheers!
Wishing you a wonderful 50th birthday filled with the finer things in life. You've worked hard for more than half your life so you've definitely earned it
Now that you're 50 you've probably got more hair where you don't want it and less hair where you do want it. You can't fight it but at least you can still let your hair down and have fun on your birthday!
Congratulations and commiserations on your big birthday. The good news is, you made it to 50. The bad news is, it's all downhill from here.
Happy birthday and congratulations on turning 50. If you're anxious about getting old just think, ten years ago you were worried about turning 40!