even tho frisk was shown in undertale and not in deltarune, and the undertale community said frisk is around 10, in 2015. Thats means frisk is POSSIBLY 13 in deltarune.
For chara, it was said that chara was still a child, so around 8. That means chara possibly fell 2014, which means chara was 9 in 2015, when frisk fell. So chara's POSSIBLY 12 in deltarune. Even though she was a ghost.
Even tho this is the deltarune universe, just wanna say this if there is a game out there that adds chara and frisk into a deltarune mod.