ripe old age

act one's age

To behave in a manner appropriate to one's age.

act one's age, not one's shoe size

Synonym of act one's age (“to behave in a mature manner; to avoid being childish”).

age before beauty

A phrase said to allow older people to go before younger ones.

any old nook or cranny

Alternative form of any nook or cranny.

bad old days

The past, seen as a time when things were worse.

big old

Emphatically or impressively big; really big.

chip off the old block

Someone who takes after one of their parents; (generally) a person similar to another.

come of age

To reach a specific age where one is legally considered to be an adult.