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Personally, I'd put him between 37-44
I think if the entire Batfam exists he's gotta be at LEAST 35, but closer to 40. And I like him being a little past it at this point.
I also think 40-48 is peak Batman. The experience, physical ability, and knowledge are all there.
What type of Batsuit would you want to see Michael Keaton wear for the Flash film?
A more modern rendition of his classic suit? The Beyond suit to hint at what's to possibly come? Something like the Kingdom Come suit?
Pic 1 by @datrinti
Pic 3 by @ShatterverseEnt