The typical human brain shrinks over time, losing its ability to remember as well as other cognitive functions. But the brain doesn’t have to age this way. In fact, it’s completely possible for a person to maintain a youthful mind well into their 90s. If you want proof, look at the story of Olga Kotelko, an ordinary grandmother from Vancouver who took up track and field at the age of 77 and dominated international sports competitions for nearly 20 years. Her story is not only inspirational but also provides insight on how to maintain strong mental health as you age.