Fighters who had success late in career

I'm trying to find out if there's a pattern to the fighters who have success in their career in their late 30's and early 40's compared to the age they started boxing.

Right now I got
Sergio Martinez who is turning 37 this month and started boxing at 20
Bernard Hopkins who is 47 and turned pro at 23


Help name some fighters who had success late in their career and follow this trend or even go against it. :thumbsup

 

Marquez is 38 and had his first pro fight at 19, but his amateur career was kinda short. I'd have to look up when he started boxing :think

:yep I'll count him I guess.
He's 39 and had his pro debut at 27

Lewis had his debut when he was 23 but was in the Olympics at 18, so he may be an exception.

Vitali is 40 and turned pro at 25
his bro is 35 and debutted at 20

 

I'm gonna need time to research all their debuts and ages