No
No one!
He is 999 years old!!!!!
999 years
You could theoretically be 999 999 002 009 or 999 999 002 010 years old; however, because the universe is nowhere near that old, it is preposterous to ask how old one would be given a birthday in a year that never existed.
he is over 300 years old
some animals can live to be that old
Lil's Wayne daughter is 9.245879214657995421654 years old
A person who has lived for a million years would be a million years old.
Before the dinosaurs existed which is 99 999 999 999 999 years ago
999 999
A centenarian is a person who is 100 years old or older.