ocr: A handstand is child's play for lifelong gymnast George Nissen, entertaining his grandson Jake in San Diego. Inventor of the trampoline, he is: still launching new: products at age 83. "People think I'm nuts, he says. "But gee, Icould have: 20 years to go." Keep- ing both his body and mind in fine shape, he may well tumn that possibility into reality. can be made to act younger than its age. Studies show that the aphorism "Use it or lose it"a applies equally well to the mind. Rats kepti in a visually and intellectually stimulating envi- ronment, such as one with complicated mazes, stay smarter ...
