This is very true. You also know you’re old when the waitress automatically gives you the senior discount without being asked. The thing that makes you feel the oldest, though, is the honesty of children.
On one of my visits with my brother, his granddaughter was spending the night at his house. She had not seen me in a while, and she stared as if she didn’t quite recognize me. Finally, she came closer and said, “You look different. Did you get gray hair for your birthday?”