I have a handwritten one that I've kept since age 12 when the depression/extreme shyness and all that other crap started...although I haven't written in that one for a while. I also have an online blog that I update regularly.
I prefer having a handwritten one...I like the fact that I can keep it in one spot and no one will stumble upon it like they can on the net. Although it's so much easier to type my thoughts rather than write them, my hand always gets really tired. I'd like to get a cheap typewriter, that would be nice..
I started when I was 12 I think, and gradually kept going through handwritten journals until now, at 20. I also have an online one, but the real juicy stuff goes into the handwritten one
It is funny to read back entries. Stuff that I was worried about as a kid (school, driving etc.) they all turned out fine. Although I do still have the same complaints and outlook as life as I did back then.