The time to "get into" retro games is when the "new" generation is several years old and people are unloading their "previous" generation consoles.
The PS2 is 3 generations ago
The PS1 and N64 are 4 generations old
etc
The amazing thing about video games though is that a rom is a rom. Being on a cartridge doesn't instill magical properties.
You did miss the boat on NES/SNES/N64/GC era retro collecting. Fear not, all of those games are still playable thanks to the community! Go honor their hard work that preserved and made these games playable on a $35 computer the size of a credit card and play a super mario world romhack where the levels are all renamed after weed jokes.