I don't know any, even tho' I now many bodybuilders, some've been at it for 20+years.. Maybe because most of them did this to a certain level, not trying to become a pro (international titles were enough for some).. I actually know a few very good examples. Guys, who've been on gear for a few decades str8, they are 45+ currently, all look terrific, way younger than most fellas of their age, healthy and going strong (main characteristic that all of them share is - no narcotics, no alcohol, no smoking or other harmful recreational acitivity). They may not reach 70, but hell, when I know what kind of life they lived (a very fun and full of great experiences..) - it's certainly worth to "pay the price".
On the other hand - if someone is doing bodybuilding for a title, they are doing it for wrong reasons.. they won't last long, they'll loose the track most of the time. Bodybuilding should be about longevity, about vitality, a state of mind of a constant improvement, a strive for a "perfection", kind of a philosophy.. and it really boils down to a basic evolutionary stuff afterall.. to keep one as fit and as competitive physically for as long as possible. Bodybuilding is a transcedent acitivity, when humans transcend their biological limits and go "beyond", it's quite fascinating actually.
To chase titles or pro cards may be a very futile activity tho'.. But still - for each his own.. Not like all bussinessman succeed, not like all family mans are successfull with their families, not like all politicians are good at what they do, etc, etc.. Afterall - there are far worse activities that people indulge in, compared to bodybuilding..
The funny thing is - these fellas I know, who stayed in bb'ing and kept doing what they were doing.. when they meet their peers from the days of youth, it doesn't matter how successfull these are in other fields of life.. when they meet them - they act like they "don't recognize", as they all look like shit and are waaay more downhill physically than these who kept lifting and............. injecting, ironically.