5. You keep thinking to yourself, "Wow! That fiddle player is amazing!"
4. You sit by the edge of the open admission amphitheater seating so that you can only see Dave's profile, but who cares because you can get to the bathroom easily.
3. You want to get to the bathroom easily not because of beer, but just because that's how it is now.
2. You sneak trail mix bars and fruit in your purse into the concert.
And the final way you know you're getting old?
1. Instead of being inspired by love, you want to tell the groping young couple in front of you "Just wait. Get married. Have kids. And then let's see how much you want to slobber over each other."
Oh, and you also want to hit them...Hard.