Brian pointed out that today is the 10th anniversary of The Matrix. I found this hard to believe at first. Michelle and I saw it without having looked into it much; someone had told her it was good. I remember walking out of the theater with her blown away and pretty happy with the $10 or so we had spent (the AMC at Southlake used to be cheap while it drove the other theaters out of business).
While it's definitely been 10 years, it feels more like 6 or 7 to me. I think the main reason for this (besides my inability to comprehend the passage of time) is that 6 or 7 major things have happened in our lives since then, and it's more natural to mark the passage of time with these life phases or eras.
For example, since seeing the movie we studied abroad, moved to another apartment, went to Italy, graduated, moved to Florida for our jobs, went to Peru, got graduate degrees, and moved back to Atlanta. (that's 10 items actually, but a couple of them occurred in the same year and are lumped in my mind)
With this in mind, I think it's important to keep doing stuff. Try more things, move more, jump to another job or line of work. Travel more often. I think you can make your life feel longer by doing so.