When you have aches in your hands, legs, feet and joints
When the things you look forward to aren't so much as activies but going to sleep or just sitting and vibing
When don't understand slang anymore, my example being I don't know what Cap/No Cap, AFK, Throwing or memes like tunga tunga tunga or a shark with nike sneakers on mean.
When you aren't as horny anymore as in constantly thinking about plapping
When the things on your mind are either financial or medical issues sometimes both.
When you realize that cartoon or video game you liked is now 20 to 30 years old now
When you find one of your old handheld or consoles and wonder "man, this thing is tiny, how the fuck did I play this so easily" or "Man, this game is hard, how did I clear all this so easily"