7 Signs you are no longer that young

I am 23 years old, that's young right? Obviously to any one older than me it is considered young, but I have had a few situations with various teenagers that has proven otherwise. I can remember my teenage years like they were yesterday, but again and again I am reminded of how much I have changed and 'aged' since then. I know how ridiculous it sounds, but I genuinely had a moment of acceptance that I am no longer as cool, young and carefree as I was when I was 16 (or 18). Here is how I came to this conclusion.