I think she may be older than Pocahontas. But I'm not entirely sure
I didn't include Ariel, Jasmine, Mulan, and Aurora, because apparently they're 16. And obv. Snow White is 14, so..

I read that she was 19.

oh...then I change my mind. I always figured Poca to be in her early 20s.

I think that Tiana and Poca are both around nineteen, but Tiana just seems a tiny bit older.

Seems the most mature

Yeah, they certainly didn't made Cinderella "too old", because, apparently it's not cool to marry after 17. Belle isn't older than 18-19, because Beast is 21, and Tiana, well it's said that she is 19

Pocahonats' facial features lead me to believe this. She doesn't look nearly as babyish.

Tiana and Belle are the same age (I think), 19. Cinderella is most likely the youngest of the four.

Snow White is 14

Cinderella I heard she's 15

Aurora is 16

Ariel is 16

Belle is 19

Jasmine is 16

Pocahontas is 20 or 21

Mulan is 16

Tiana is 19

^^how do you know their ages?

Well I'm not sure about Cinderella I heard someone say that Walt Disney ment for Cinderella to be older than Snow White but younger than Aurora but I found the rest out on fanpop wikipedia the movies and some offcial websites

Belle and Pocahontas both strike me as early 20's so I just picked the one the other people would be less likely to pick.

I'd guess these are their ages:
Snow White - 14
Cinderella - 16
Aurora - 16
Ariel - 16
Jasmine - 16 going on 17
Pocahontas - 19
Mulan - 17
Tiana - 19

She just looks like she's the oldest.

In my opinion:
Snow White-14
Cinderella-17
Aurora-16
Ariel-16
Belle-19
Jasmine-18
Pocahontas-22
Mulan-19
Tiana-20

and then tiana

pocahontas, tiana and belle.
in my opinion

snow white-13/14
cinderella-18
aurora-16
ariel-16
belle-19
jasmine-17/18
pocahontas-19/20
mulan-17/18
tiana-19

Snow White - 13
Cinderella - 17
Aurora - 16
Ariel - 16
Belle - 17
Jasmine - 15
Pocahontas - 21
Mulan - 18
Tiana - 20

Some of these are just my guesstimations, but some of them are revealed in the film. Aurora and Ariel are both 16, and Jasmine has to be married before her 16th birthday which makes her 15.

straggy, tiana's age is also revealed. she's 19

^^when do they say Tiana's age?

^ Yeah, I love that film. I don't remember them ever saying she's 19. :/