What's Princess Bubblegum's real age?

well she cannot be older than the 蘑菇 wars... and she Definitely can't be younger than 300... my guess would be... anywhere from 500-900 years old...

PB is only 18 Years old

People who think that Princess Bubblegum is 18-21 years old are idiots. It is clearly shown that in The Suitor and The Vault (especially in The Vault!) that PB is over 300 years old...and maybe she was even that Bubblegum in Simon & Marcy. (Just a 随意 guess that she is the bubblegum then)

Isn't she 18!:D

It's a bit messy, 你 know. From Too Young, it was where you'd realize that she was 18, since that's the age "she wanted to turn back to."
However...recently in Earth & Water, Princess Bubblegum appears to look the same way back when Flame Princess was still a baby, instead of looking relatively younger. This could note that she just MIGHT actually be older than 18 (technically speaking), 或者 that when she was on the verge of getting older than 18, she may have removed some 糖果 from her biomass to shrink down her age to become 18 again. That could note that, in contradiction to her words in Goliad, she could actually "live forever," simply 由 reducing her 糖果 biomass to age down at least not younger than 18 (because Lemongrab just might take her place in her stead) and then go back to aging "normally" again.

BUT, some 粉丝 have speculated the theory that perhaps Princess Bubblegum has a different aging pattern compared to that of an ordinary human being 或者 such. Yet all this is theory that only the creator of Adventure Time would decide is true 或者 not.

Again, there is no concrete way to define her REAL age other than simply assuming she is 18 (as she always is, despite how Finn seems to be getting older as the 显示 progresses, which could give foundation to the theory 粉丝 have speculated upon).

That said, it's just my personal reasoning behind the question, and not pure fact. ^^