Now there's a question that makes me nervous...
My father was a part-time Sox fan, born out of hatred for the Yankees. At some point along the way (I think I was in about 10th grade or so) he brought home a Red Sox cap for me. I wore that hat until it disintegrated, sometime in Spring of 2005.
I didn't follow baseball much in high school and college. But once I was in the work force for a while I got back into it a bit. I really began paying attention to the Red Sox back in the late 90's when Pedro came to Boston. At the time, I had neither the resources nor the free time to devote to being a fan as far as purchasing Extra Innings or such. I was relegated to being an ESPN fan (Sports Center, Baseball Tonight, etc.) My interest was peaked in 2003 with all that season held. I was in front of the TV for the ALCS. Then I followed as closely as time allowed in '04. The time I devote to the Sox and baseball in general seems to get greater every summer, now that I can get MLB.tv and have XM Radio.
Now, depending on why you asked the question will (I suppose) effect how you judge my answer. I have not suffered since my early childhood as a many of you have. There are many, mostly Yankee fans, who call me a bandwagon jumper. All I can say is this: Whatever I am, I am a fan. More importantly, I am a fan not because I chose the Red Sox. I am a fan because the Red Sox chose me.
So anyway, why do you ask?