Man, listen.
If you played before 3rd edition, you're old school. I know that those from the ancient days yon' before that say that they are the real old school, not many more decades can pass before playing before 3rd edition is just straight up old school.
And, the game before 3rd edition was completely different. There are whole new paradigms in play with WotC D&D and beyond that have completely changed what TTRPG of today are, amped up by the lineages of Vampire, PbtA, etc etc. People who played OD&D have a lot more of a similar experience to AD&D, then someone who has played OD&D vs 3 or 4E.
Everyone's going to have their own different definitions of this, I mean, pre-2000 vs post-2000, these are two different worlds the more time that passes