Just look at how healthy steroids have kept Sylvester Stallone.
He is now in his 60's, and has a beautiful young ex-model wife, and two lovely young daughters.
Maybe. He looked huge in that movie, but there's a 55 year old school teacher I grapple with (and kicks my ass) who's winning his division in the North American Grappler's Association (NAGA), and he's ripped like Stallone. Plus there's cosmetic surgery and botox to tighten up spots.
I think Stallone could've pulled it off with a bit of time and money (some people are just genetic freaks of nature), but it wouldn't suprise me if he did juice up to make the process a lot faster.