Yep. I remember back in the Summer of 2017 when I went on vacation with extended family (grandparents, uncle, and cousins), one of my second cousins thought I was 13, when I was 19. And I myself believe I look younger than my age, as well. I am fine with this, I like that I am aging more slowly appearance-wise.
Since I have no interest in drinking, smoking, using tobacco products, going into bars/clubs, etc. and don't have an ID yet, I have only had a lack-of-an-ID issue once, and that was back on June 4th, when me, my dad, and my brother were going to get their vaccines. My dad and my brother are fully vaccinated, whereas I have not even gotten my first dose yet, since I don't have an ID. The only reason I can see why IDs should be required for vaccination is to show proof that you are in the eligibility range, if you "look too young".