>>44170991Like most gym leaders probably late teens to early 20s. But like most supporting characters in the anime they age her down.
Mallow in the games is late teens, my guess would be 18/19 since it implies she owns a restaurant instead of helping at her parents' restaurant like in the anime.
Game Serena is probably mid teens.
Game Lillie is actually roughly the same age as anime Lillie, though I think she's a little older than the Sun/Moon protagonist, maybe by a year or two (bit definitely younger than Hilda, though Hilda is 14/16 depending on the game but drawn like she's older, though most of that is the legs and outfit, looks like they designed her to look 17-18).
Then there are really slim lanky characters like Lusamine who would look like mid teens characters if they were short.