This is something I wonder about a lot, as I've often heard it said by people older than myself and am even now finding (or thinking) time is going faster than it did when I was 15. But maybe it felt the same then also and it's only in retrospect that I think it didn't? I don't know, which is why it's interesting to read other people's takes on it. It sounds like you've had a very busy few days, which probably explains why it seems to go by so fast.:) It doesn't, really, it goes by at the same rate, you're just making the most of it.
Like I said to another reader who commented, my days are full, and full days have always seemed to go by faster. We oldsters have a different perspective on past, present, and future than when we were little kids, and I think that really affects our concept of time passing.