Admittedly, few are getting better at that age. Or for that matter for thirty or forty younger.
Still, some are a lot sounder than you’d believe. $HERSELF recounts an black farmer in Virginia she saw in hospital in the 70s – dude was in his 90s and was hospitalized after being (IIRC) injuries from being kicked by a mule. On release, he went back to working on the farm same as ever. Didn’t really surprise her, given one of her uncles died at 95 after being thrown from a horse while working his ranch.