He was awesome in the TV show Airwolf. For 91, yeah's he's in good shape.
My great grandfather turned 104 this month. He still drove a car up until 95 years old until his wife died at 92, after she died he didn't want to drive anymore for some reason. He's all there in the head too. His advice to live long on his 100th bday was "Stay away from booze and fast women."