Board Thread:General Discussion/@comment-27324545-20160105135410/@comment-31227451-20170801175157

Here is what I think all of the characters' ages are:

Frisk: 8-10

Chara: 10-11

Asriel: Same age as Chara, give or take a few months

Sans: 23-27

Papyrus: 20

Toriel: ~140

Asgore: About as old as Toriel

Undyne: 24