Christopher Hudspeth / Buzzfeed

1. You start reading the nutrition labels on food because you're concerned about carbs and weird ingredients that sound like the names of poisons.

2. The thought/purchase of new furniture is actually...exciting?!

3. You start caring about things that never mattered, like having a favorite detergent or using coupons.

4. When it comes to dating, you've got less patience for nonsense. Things you used to get upset about or try to move past are now enough to cut someone off. Red flags are full-on stop signs.

5. You find yourself choosing comfort over fashion more often.

6. Your social media feed is at least 50% pictures of people's kids.

7. You used to carelessly sign anything, but now you read the fine print on leases or contracts so you know precisely what you're getting into.

8. If someone coughs, you're keeping your distance. If someone sneezes, you're avoiding 'em even if they claim it's just allergies.

9. Beer pong used to be fun, but now it's just gross to think about all of the lint and germs that are lingering in your beer.

10. Your hangovers are SO MUCH worse. You used to be able to wake up, drink some Gatorade, eat a breakfast burrito, and be good. Now it's 24–48 hours of misery.

11. Getting carded is honestly so flattering that you're thrilled to display your ID.

12. If you haven't seen your first gray hair yet, you're dreading its inevitable debut.

13. If you have seen your first (and second, third, etc.) gray hair, you're learning to accept that this is life now.