When I was 15, I read "Emily of New Moon" (by the same author as "Anne of Green Gables). In the story, she writes a letter to herself 10 years in the future - and I started doing the same thing, every year on my birthday. This year, I got to open up my letter from 25 AND I revisited 15's letter. It's really interesting to see how things have changed...and to be reminded of where I've come from.