Often used to gently point out someone's age-related hair loss.

Aging Association

Be cautious, as mentioning someone is thin on top might be embarrassing or offensive.

Sensitive Topic

Use in informal contexts, it's not suitable for formal documents or discussions.

Evokes a clear visual of how something looks less filled or populated at the top.

Implies the top layer or surface area specifically has less of something.

Remember it's also used for things other than hair, like grass or paint.