Wesker - 38 going on 46, as of his cut (from RE 5: Lost in Nightmare). In Deerington/Deer Country canon, he's probably 51 (going on 38, thanks to Better Living Through Mutagenic Pathogens)

It's a canonic estimate that he was probably born in 1960, but his exact birthdate is unknown.

We don't even know his original identity, thanks to Spencer snatching the poor tyke from his family.

(I have a huge backstory for him)

James Oldham-Jaquith - as of where I'm taking him, probably in his late twenties/very early thirties.