Metallica at 20 years old
Not one of them is over 21 years old, and they were already turning out stuff like this.
People today can replicate their sound perfectly, but nobody then (nor really now?) was innovating new sounds at the velocity they were in the 80’s. Every one of their songs were incredible and had all kinds of technical innovations in them.
Who would have thought they would grow up to this:

Remember kids – those ‘boomers’ many young people blame for everything were often much cooler than you and made a lot of the same choices you’re making now. And it’ll happen to YOU: