I've been playing FIFA 18 on Switch with my friends a lot in school, I bring it there probably three times a week. 

About once a week when my best friend comes over to play games on Fridays barring a conflict in schedules from time to time. I didn't bother to buy the last Halo because they axed the splitscreen co-op that we had so much fun playing in the previous games.

All the time when I was younger, but not for the last two or three years now. People just don't seem as interested when they come round now or prefer to play online co-op instead.

Not as often as I would like to unfortunately. I much prefer local multiplayer to online, but it can be difficult to get people together to play games in the same place.

As a kid, I did a lot. As an adult, not at all.

Not too often nowadays, besides maybe Smash friendlies and Jackbox Party at college.

Skylanders, Minecraft and MK8D on the Switch, USF4 on the PC/PS4 and X360 at least once per week either at friends places or here, have a projector for use with Street Fighter which is a hard experience to rival in terms of "couch" co-op.

Very often - I tend to get my kids games they can play coop, and often I have (or want) to jump in with them.

Not so much lately, sadly. My friends are busy most of the time so it's hard to gather everyone to play some local MP, and sometimes I just put gaming on the side to focus on other things. ;_;