Mostly I play on the consoles, Xbox One X and PS4 Pro. And like everybody mentioned, I have a huge back catalogue, thus also not buying games on release. I have so much to play, never know what to play next, I don't like playing too many games simultaneously.
I also play from time to time on my iPad, I bought the new Pro 12.9" some months ago, and it's absolutely fantastic. Mainly on that I play some strategy games, puzzle, sports and adventures, there's so many great ones for IOS (probably also for Android).
I still play retro games from time to time, on my PS3, which I also still use to play my many PS3 games, otherwise I'm using RetroArch and play some games from consoles I never owned, there's some good sports games around, as I enjoy them the most.
I don't have any retro hardware anymore, besides XBox, PS1 & PS2, Wii and a GC, and I'm not planning on buying some again. Probably gonna give them away at some point, like last time I gave a PS2 slim to a friend, and a PS1 to another.
I run emulation still a lot, mainly to test out some games, lately I was testing all the translated ROMs from different consoles to put them in my collection, also for the use on my PSX Classic. I run emulation on PC, and then RetroArch on my PS3 and PSX Classic. Didn't use RetroArch on my PC yet.
RetroArch is a brilliant solution for so many platforms these days. But in PC the different emulators are often quite a long way behind the standalone emulators. MAME and WinUAE are very good examples of this. But for an all in one solution it's still great. I use it on my SNES mini.
If you haven't played a classic game in years, it's never too late to start!