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And I have proof. This is a quote from Skyla in BW:
"Just now, as I was flying the cargo plane, I saw something on top of the Celestial Tower. I'm sure that it is a sick Pokémon! If it is, I can't just leave it there! I have to look into this right away."
>I was flying a cargo plane
For Skyla to fly a cargo plane, she needs to be a cargo or commercial pilot. To become a cargo pilot, one must first obtain a commercial pilot's license and accumulate a certain number of flight hours. And in order to obtain a commercial pilot's license, you need to be at least 18 years old. Therefore, we can conclude that Skyla is at least 18 years old at bare minimum.