Board Thread:General Discussion/@comment-27324545-20160105135410/@comment-39394247-20190921164359

For the Temmies, anywhere from 3 to ~40, at least the typical ones. There may be some under 3 who speak differently.

If Undyne is the yellow human amalgamated with a random monster from Waterfall, than ~200 is more likely than 20s. Physically she is in her 20s though. Alphys is similar to Undyne in age. It would be kinda creepy if Alphys originally created Undyne though... I usually think it was Gaster who did it.