Board Thread:General Discussion/@comment-27324545-20160105135410/@comment-37313691-20181226031235

My guess:

Frisk: 8

Flowey: idk

Toriel: like 55-75 goat years but technically like 500

Asgore: same with tori

Blooky: late 20’s

Sans: 25

Papyrus: 21

Undyne: 29

Alphys: 27

Mettaton: like 2-5, but in robot years late 20’s

Muffet: 16

Temmie: at least 18 (but over corse they have the soul of a 12 year old)

Asriel (ded): 12

Adult Asriel: 20

Chara: 9

That’s my guess. Argue with me all you want.