Board Thread:General Discussion/@comment-27324545-20160105135410/@comment-31750551-20170622152230

Frisk - She's probably around 9.

Chara - Same as Frisk.

Napstablook - Can't guess a ghost's age.

Toriel - Probably over 200.

Sans - Maybe 19.

Papyrus - Maybe 18.

Monster Kid - Probably 10.

Undyne - 28?

Alphys - Same as Undyne.

Mettaton - Same as Napstablook.

Asgore - Maybe a little older than Toriel.

Asriel - Probably 8.