Happy 50th birthday. Say something warm and sweet in his/her 50th birthday. Below you can find several nice quotes for people who celebrate their 50th birthday.
Just check my previous post about variety 50th birthday quotes. Hope you enjoy 
Personally i love this :
“Your body may need a tune-up but your spirit has taken flight, happy 50th birthday”
“The great thing about 50 is that you see the world much longer than your younger brother”
“50 is a milestone age and great achievement, keep doing good things”
Once again i just wanna say “happy 50th birthday”