I only know the numbers for men, but supposedly, physical strength peaks at the mid-20s then holds relatively stable until the mid-40s. After that, it's a pretty straight decline. There were a couple academic articles I read about this a few years back (search for "strength age" at scholar.google.com), but I forget where I got those numbers exactly.
I know that Mahler is around 60 and still deadlifts 400+, so there's certainly still hope at more advanced ages.
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