0% new: from 2024 (average 15%)
0% recent: from the last 1–7 years (average 47%)
100% classic: older than 8 years (average 37%)
I am helped by being limited to an 8 years old notebook laptop currently.
The 5 games I have played this year, all for the first time: Stardew Valley, The Darkeness II, Star Wars Battlefront II 2005, Outlast, Oblivion.
That 15% number is reassuring. Huge majority of Steam users are patient gamers!