Here are the several items that spoke to me:
You get super excited when you go to a concert and there are seats.
You'd rather pay a little more for a "nice, clean" hotel room than cram into a hostel with 12 of your friends.
There's an increasing number of musical artists you haven't even heard of.
Running hurts your knees. Elliptical machines hurt your knees. Everything hurts your knees.
Teen slang makes you viscerally angry. #yolo
You get really excited about lame stuff, like low interest rates. Yes!!
You wonder, seriously, how you ever pulled an all-nighter.
You've been to a party where at least two of your friends brought their babies.
.. and now it's 9:30pm, so it's time to get into my electrically-heated bed and sleep like an almost-30 person.