How old do you think the main characters are, based on their behavior and the information provided by the show? Biological age, though. Eclipsa's age would be 200+ if otherwise.
Marco: 15 as of Lava Lake Beach
Tom: weirdly enough thereās no reference to his age, even among tweets by the crew as far as I could find, but according to Star in the Book Of Spells heāsĀ āclose to her ageā, so no 100 years old teenage looking demons here. This is not Twilight. Or an anime. Likely 15 or 16.
Pony Head: according to an old tweet by Daron sheās one year older than Star, so sheād be 16 or close to 16
Moon: Iād say in her early mid 40s
River: looks older than Moon at times, especially in the close ups in Camping Trip (likely for comedic effect), but we know they have the same age, so heās probably in his early mid 40s as well. Or 17 felled stags according to the Johansensā calendar
Eclipsa: probably younger than Moon since she became Queen at an early age and Meteora was just a baby when she was crystallized. Iād say early 30s.
Ludo: even if in some episodes he looks like a old man heās probably around 30, since his parents are still alive, he has several older brothers, and Dennis looks like a late teen but old enough to remember him before he left home.
Glossaryck: as old as as the Universe but also not quite as old
Janna, Jackie, Alfonzo, Ferguson and all the other teens from Earth: they were in class with Marco and Star so theyāre all 14-15 depending on how early or late in the year their birthday is.Ā
Buff Frog: given how fast his kids are developing I wouldnāt be surprised if he turned out to be 8