“I would advise people not to rest when they grow old because if you rest, you will soon become very weak and incapable, and may become senile. Be active after you reach retirement age,” Dr Mahathir said.
“It is the same as your muscles. If you don’t use your muscles and lie down all the time, the muscles cannot even carry your weight. You cannot stand. You cannot walk.
“The brain is the same. If you don’t use your brain, you don't think, you don’t solve problems, you don’t read, you don’t write, the brain regresses and you become senile. So always be active,”
https://www.nst.com.my/news/nation/2...health-secrets