subject: Be Active, Live Longer and Healthier! [print this page] Thus unlike what we think, old age is not about weak cognitive and memory, if we remain active and keep ourselves busy, we can definitely keep our wits about us. Further, research also shows that human brain can adapt and grow even in old age. The decline in mental abilities in old age is more because of degenerative diseases rather than old age. The other age related losses like poor memory and cognition is more due to mental inactivity rather than old age per se.