Time Flying

I had a really strange experience today. I was talking with a woman I work with about age. She was saying that the little children that come into my work (Jersey Library) see me as an adult, as they're too young to understand the kind of in-between that a teenager is. So yeh, they'd see me like they'd see other 'grown-ups'. This isn't the strange part, the strange part came a few hours later, and tied in well with the subject of age and time etc. A girl came into the library, and a few years ago I was really good friends with her. We went to a christian youth group together and I became good friends with her and some other of the girls who went. We wern't the same age, they were all about 4-5 years older than me, but because we were together so much, so similar etc it just 'felt' like we were the same. So anyway, she came in today and asked me what I was up to. I just said, you know, last year of school, uni next year, you? And she said, did you see the guy i came in with? We're getting married next year. Now, this completly threw me. It was as if a girl in my year at school was telling me this. It was honestly the weirdest thing I've ever felt. Of course I knew she was older than me, but I just 'saw' her as my age (even though she's finished uni now, and I know that), as a teenager, just as those small children in my work 'saw' me as an adult. I've been trying to work out how I felt about this encounter and I've come to the conclusion that I'm actually very sad about it. I've missed out on years of a past friends life, someone I desperatly wish I had kept in more contact. This was a reminder to me that, actually, we don't have 'all the time in the world'. We move, we grow up, we grow old and we die. It goes so quick and I'm not ready for it to go so quickly. I don't want to be reminded so much of my own mortality.
Time flies on.