This is so American centric, but more to the point, coming from a highly privileged (mostly classist, cisheteronormative, and ableist) point of view - it isn't just the drinking age (in the UK for example it's technically legal for a child as young as 5 to consume alcohol), but it's mostly the fact that a lot of people have been responsible for themselves, and often others, potentially from childhood because they/we literally have no choice - being disabled, having a disabled parent or sibling, losing your parents or guardians at a young age, being kicked out for being queer, being kicked out for being disabled, losing your home due to poverty, not having parents or guardians around to do the caring because they're too busy working 3 jobs to make sure there's some food in the house, and so on and so on (from living in a war zone to experiencing kinds of trauma and abuse I've not already mentioned)..
When you consider all of those, and as someone who has/is living a few of these situations myself, the idea of being "fresh" at 30 (which was a while ago for me) is not only absurd beyond words, but it also erases all of the hardship, and achievement, of making it to 30 despite all of the hurdles in the first place.

So sure, if this take makes you feel better about your age - great, but it's more important that it serves as a reminder of how fucking privileged and lucky you are to be able to hold that point of view.