Hey, I'm a 20 year old medical student, I've always had almost compulsive need to know the "truth". In retrospective I have been moving towards LW for a long time, first off I came in contact with Aubrey De Grey's campaign against aging, and decided as a 17-year-old that I wanted to dedicate my life to that cause (hopefully the problem gets solved before I die so I don't have to spend whole my life battling aging). Then from that I moved on to other transhuman ideas but got a bit skeptical about Ray Kurzweil's senario, began thinking about brain-uploading meant + morality + meaning of life + free will --> got depressed, read Dennett -> got a lot better, saw a few videos of Eliezer Yudkowsky and "thought he seems like a super-sane person, wonder if he stands on solid ground" found Less Wrong, prioritized becoming a more rational person.
Still a bit skeptical about plausibility the singularity happening any time soon(<50 years), so I right now I'm doing stem cell (hES, IPS) research, when my studies allow. But really enjoying LW (as well as finding it really useful).
Cheers! (And sorry about the "my life story")
Welcome to Less Wrong, Wix! Kudos to you for working in anti-aging research.