Questions about example sentences with, and the definition and usage of "Leathery"

A: Leather is very rough and hard. The exterior is something outside. Simply put, leathery exterior means the rough and hard face or attitude that 'he' has. It means that he is stoic, that people think that he's rough because that's what his exterior shows.
On the inside though, he is gentle and calm so appearances are wrong.

A: it means the man is very old and his face looks like a mule