Xiao Pai is actually older than Lest, according to her dialogue.
But there is no correct answer, as Hashimoto said that the ages are up for interpretation. He gave his opinion going by
looks, and he put Kiel the youngest, then Arthur-Doug-Vishnal around the same age, then Dylas, then Leon being the oldest.
"When it comes to Vishnal, Doug and Arthur, the order’s quite tentative and difficult to place. Arthur may be calm and knowledgeable, but he’s still lacking experiences, which explains why he’s in the same age range with Vishnal and Doug. Kiel without doubt is definitely the youngest among them. But then, he added that since the game takes place in a fantasy world, so it should be reasonable to consider it when you think for the suitable age for marriage in this game. He gave no exact age for any of them and leave it to the player to decide."
For girls: Hashimoto ranks their ages by looks as Forte > Meg > Clorica > Dolce > Xiao > Amber "Forte’s the oldest among them. Also, despite her seriousness and sense of duty, she’s in fact the girliest of all. Xiao Pai and Kohaku look very young, with Kohaku looks the youngest. She may be indeed the youngest…Note the “May”. It’s important. He leaves it to the player to decide,
but after you’ve seen her marriage sub-event." - Both quotes are from an official magazine article that was posted on the Kaze no Travelers tumblr. (There are spoilers, beware)
http://kaze-no-travelers.tumblr.com/pos ... ents-about
For my opinion, I'd say Leon in his early 30's, Dylas late 20's, Doug/Arthur/Vishnal early 20's, Kiel 16-18.
Leon: Early 30's
Dylas: Late 20's
Doug/Arthur/Vishnal: Early 20's
Kiel: 16-18
Lest: Early 20's, or 18-19
The gals are harder to place for me. I'd say that Forte/Meg are probably mid to late 20's, Clorica/Dolce mid 20's, Xiao early 20's (but older than Lest) and Amber "16-18" for appearance alone.