Older people in strawhats

[Blackangel]

if we don't consider brooks, then it would be robin.
i wonder why a woman at that age decided to join a group of youngsters.
she even invited herself into that group

 

[MadaraUchiha]

Robin is 30 so she's not that old plus she didn't join the group for their shenanigans, she joined for the Poneglyphs.

 

[Blackangel]

she is almost as old as me.
i wouldn't want to join a bunch of teenagers but i think she is very obsessed with ponyglyphs