My understanding, and I don't think I've seen a refreshed study on it so it could be a weird steroid era anachronism, is that super athletic players age far more gracefully. The idea being that these guys have multiple way of contributing, so if one area falls off they still provide value in others. When Miguel Cabrera dropped to being a league average hitter last year, he was completely unplayable. When Javy is 35, he'll probably still be solid defensive 2B/3B who mashes lefties. This could be out of date though, for the same reasons that aging curves have started skewing younger and younger. I’m more worried about Javy’s offensive profile eroding long term (high Ks, low BB, low Contact%, quick twitch bat speed, base running, etc) than I am about defense. I have faith he can be fine and even plus defensively somewhere well in to his 30s (2B/3B/LF). It’s an extreme but look how quickly Carlos Gomez fell off. Surprisingly, it's not a thing (again with the very large caveat about how the steroid-era affects these sorts of studies) https://www.beyondtheboxscore.com/2011/5/31/2199146/hitter-aging-curves