He is young but he thinks old.

When I was young I was called a rugged individualist. When I was in my fifties I was considered eccentric. Here I am doing and saying the same things I did then and I'm labeled senile.

The old often envy the young; when they do, they are apt to treat them cruelly.

Young men think old men are fools; but old men know young men are fools.

Young men think old men are fools; but old men know young men are fools.

It's both ludicrous and embarrassing to recall one's youth.

The young people think the old people are fools — but the old people know the young people are fools.

I can't believe I've turned into a typical old man. I can't believe it. I was young just minutes ago.

I think they look upon me as an old child, because I'm so little.

He is young—well, younger—and idealistic. Which is to say, foolish.

Young men have a passion for regarding their elders as senile.

I am a very foolish fond old man, Fourscore and upward, not an hour more nor less; And, to deal plainly, I fear I am not in my perfect mind.

"With age, you acquire a certain humility...The longer I live, the more uninformed I feel. Only the young have an explanation for everything. At your age, you can afford to commit the sin of arrogance, and it doesn't matter much if you look ridiculous" (p50)

Though old himself, he disliked old men.