I got on-the-job training to be a pharmacy tech at a Walgreens while I was in college. My state required that you be licensed at the national and state level, but it was just a test and some continuing education credits.
My current state doesn't require either, so the techs are definitely skewed younger. Thankfully I finished college and work elsewhere now so I can only guess at their ages but teenagers seems accurate.
This hurts my heart as an elder Millennial who took AP Civics in high school. We are failing the kids so completely...