Board Thread:General Discussion/@comment-27213375-20160305063709/@comment-26887879-20170218140424

My headcanons:

Toriel: 100+ (physically around 40-45)

Sans: Not older than 25

Papyrus: Not older than 21

Undyne: Around 23-24?

Alphys: Around 25

Asgore: 100+ (physically late 40's, early 50's)