>>38099494She was the Champion years before the player character and was therefore presumably 11 at that time, not during the S/M story. she specifically says:
>A few years ago, I was a champion of the island challenge, too. Just like you. I've been traveling the world to improve my skill as both a Trainer and as a golfer. When I heard that they'd made a Pokémon League in my own home region, I came flying back to serve Alola.Considering she's also a pro golfer now, and the youngest of those is around 19 I doubt she's younger than that.
Hell, Mallow is implied to nearly be as well because she's talking about what she'll do next. She's clearly younger than Kahili and they stated you don't have to step down from Trial Captain until you're 20.
