[barce]

I disagree. If you keep a journal, life goes by just as fast at 30 as at 19. The key is definitely novel experiences. There's some research to back this up: http://www.dailymail.co.uk/sciencetech/article-2228221/Scien...

[justincormack]

Do not cite the daily mail. Or read it. Go and find some real research papers.