It is always in season for old men to learn.
We are never too old to learn. The world is changing every day, and there is always an opportunity to learn something new. Learning does not only comes from books and school. We can learn by interacting with people from different cultures, traveling to another country, making friends with people not your age (maybe a few decades older or younger!) Since we live in a changing world, it is important for older generations to keep learning and adapt to changes. Doing so will prevent "feeling behind." As Aeschylus indicated, "it is always in season, meaning, the time is always right.
Original Source: (Fragments, Volume III)