I'm 43. Assuming I can make it to 80, even if I play video games 16 hours a day, 7 days a week until I die I can't play all the 600+ physical games I have access to right now. Now add in my 1000 game digital library across my consoles which is full of games I got for free or on sale. Now add in my Steam library. Now add in all the ROMs installed on FPGA and modded systems I have access to. I can sit down and play every GB, GBA, NES, SNES, N64, Genesis, Sega CD, Saturn, Dreamcast, PS1 game every released. Now keep in mind I'll probably replay some old games again. Now keep in mind many of those games take well over 60 hours to complete. Now keep in mind gaming isn't my only hobby.
I stopped buying new games almost entirely a few years ago. It was partially because my backlog was expanding faster than I play the games but also I find waiting a year allows me to "sleep on it". Most games are at least a bit broken at launch. DLCs and expansions are not included and the price of games is mow over $80 where I live plus our high taxes. If I wait a couple years often times I forget entirely about it, or I get the game for a fraction of the price with it's DLCs included. In the meantime I chip away at the backlog.
The best thing you can do is buy games as you have time to play them. If a game goes on sale you don't have to buy it, even on sale you saved nothing if you never get around to playing it. It will go on sale again.