Board Thread:General Discussion/@comment-27213375-20160305063709/@comment-26887879-20160417195140

Aicilespear wrote: To be honest, if I were to stick to the canon as much as I can, you can see that in the UnderNet usernames, Papyrus bears COOLSKELETON95, Undyne bears Strongfish91 and Napstablook does have one (which I don't know) (And Alphys does not have one as well). Given one of the common method of naming usernames on certain social medias, I think I can guess ages that are relatively canonical.

Papyrus: 21

Undyne: 25

Napstablook: 94 Yeah but it was never stated that the game takes place in 2015. The year Chara fell is 201X and it is stated that many years passed between Chara's and Frisk's fall, but we don't know what year it is in Undertale universe during Frisk's adventure. Undyne's birth year might be 2091...