Canari or Iono??

Based on what I've seen on character age, Iono is believed to be an adult.

• Official Status: She is confirmed to be an adult (referenced via official materials and spin-offs like Pokémon Masters alongside adult characters like Klara).
• Fan Estimates: Most fans and community discussions place her roughly in her early-to-mid 20s (often cited around 22–24) because she is an established, professional livestreamer and a full-fledged Gym Leader, though some younger-looking designs have led to debate.

As for Canari….

Canari from Pokémon Legends: Z-A is estimated to be 15 to 16 years old (or generally listed as 15+ in official materials).

• The Clue: In the game, her grandfather Tarragon mentions taking her to a fancy restaurant to celebrate her birthday 14 years prior, placing her age at roughly 2 or 3 years old at that time.

Canari is unconfirmed but that's with a simple search on the subject.