I've just finished reading How to Grow Old: Ancient Wisdom for the Second Half of Life by Marcus Tullius Cicero. It has been on my reading list for a while, and is a short, easy read. Incredible to think something written in 44BC has so many gems of wisdom relevant to our current lives. This is one quote that particularly resonated with me:
"And as much as we should care for our bodies, we should pay even more attention to our minds and spirits. For they, like lamps of oil, will grow dim with time if not replenished. And even though physical exercise may tire the body, mental activity makes the mind sharper."
I would highly recommend this book to anyone, of any age.