We asked members of the BuzzFeed Community to tell us the moment they realized weren't "young" anymore. Here's what they said:
1. "When I fell down and no one laughed, they all just ran over to help me up!"
2. "When I was offered a seat on public transportation for the first time, and I was glad to take it."
3. "When my wife and I got tickets to a music festival, I wasn't looking forward to the huge backache I'd have from standing all day."
4. "When I started waking up at 5 a.m. for no reason regularly."
5. "When I pulled a muscle in my shoulder lifting some mouthwash. It was excruciating."
6. "When I started sitting on the floor for a long time, I realized that it was going to be a process to get up again."
7. "When my younger cousin asked me, 'So when you were young, was Madonna actually popular?'"
8. "When I was talking to younger co-workers about basketball and they thought I was actually talking about 'magic' with wands and stuff, when I actually meant Magic Johnson, all-time great basketball player."
9. "I was telling a story from when I was a kid, and I realized in the story, my parents were younger than I am now."
10. "When I realized people who weren’t even alive when I was old enough to buy alcohol are now old enough to buy alcohol."
11. "When I realized that all the bands that I used to listen to in high school are now on the 'classic rock' stations."
12. "When I had my first colonoscopy."
13. "When I was arranging some things in the bottom cupboards at work, so I was sitting on the floor. I went to stand up and got the surprise of my life by how stiff I had gotten and how actually difficult it was to get up!"
14. "When I was teaching a class of college freshmen. One day, it occurred to me that none of them had been born when I finished graduate school."
15. "When I threw out my back from sleeping the wrong way. Getting old is rough."
16. "When I watched the Amazon delivery guy scroll, and scroll, and scroll on his mobile device to reach my birth year for age confirmation."
17. "When I was a teacher, and I began teaching my former students' children. That was a wake-up call from time!"
18. "When my 4-year-old cousin just asked me what radio was, and I was like, 'Um, songs that everyone listens to at the same time and someone picks for you.'"
19. "When I was chatting with a fellow patient at physical therapy, I mentioned going to visit my mother. He said, in a surprised voice, 'Your mother? How old is she?'”
20. And finally, "When I was getting my hair done. I couldn't understand why the hairdresser hadn't shaken the previous customer's hair clippings off the cape. I disgustedly asked, 'Whose gray hair is this all over?' She replied, 'It's yours...' I was flabbergasted."
Submissions have been edited for length and/or clarity.