I'm nearing 40 and in the past few years I've tried to focus more on "real world" activities (I've never lacked them, I just felt like gaming had less value). I've done well with this by spending time with my interests/pastimes; however, my work lately has been less stimulating. As a result, something has been missing.

Long story short, I realized I wasn't getting into a "flow-state" often enough and guess where you can get an easy fix of that? First-person shooters.. (for me anyway). I don't have 3+ hour-long sessions or anything, maybe just a round or two and it's like that first cup of coffee in the morning.