As I approve of a youth, that has something of the old man in him, so I am no less pleased with an old man, that has something of the youth.

The best version of any age borrows something from another. A young person with some steadiness is spared a decade of avoidable damage, and an older person who has kept some appetite is spared the slow narrowing that passes for wisdom and is mostly fatigue. Neither is pretending to be what they are not. Both are refusing to let their age decide the whole of their character.

If you are young, find one older person worth copying and copy something specific. If you are older, take up something you would be an obvious beginner at. Either move keeps you from becoming a caricature of your own decade.