How do you know you’re old?

This is meant to be fun, but serious answers are welcome too.

I know I’m old because I say and feel so many things that remind me of my parents. A few of the things are being thrilled to change out of my daytime clothing and into my loungewear, which doubles as my sleepwear. I eat foods my mom eats that I didn’t like as a kid. I take a bunch of pills every day.