Bautista, yes. Saldana, no.
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Him? He's 54, he's been a body builder (which the role requires) and the body is bound to be going.
Saldana? She's 44, but with her body type and the heavy make-up, she could easily do this role another 10 years.
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I'd be more concerned about keeping the same actor for Rocket. The average lifespan of a raccoon is only 2-3 years, so even now they're probably going to have to start thinking of a replacement.