A man is as old as he feels himself to be.

No stake ever grew old with the bark on.

Wrinkled as a prune.

The old ox plows a straight furrow.

Old as dirt.

Forty is the old age of youth; 50 is the youth of old age.

Old as the hills.

Life is half spent before one knows what it is.

Older than dirt.

There are toys for all ages.