Well, the movies are only, what, 25 years apart? He'd be getting on a bit (he looks 40ish in AOTC) but who knows how long people live in this universe anyway? I think it's a little implausible that someone in his profession wouldn't have been offed at some point in the meantime, but that just shows his badassitude.
I think the Star Wars: Reborn project was going to conflate the two characters, or was at least considering it. I think young Boba is mostly in his own shot, so it shouldn't be too hard to do.
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