It's interesting that you grew up in the San Fernando Valley, as I spent almost 7 years there too from 8-14 years old. I spent that time in Canoga Park, but I was gone in very early 1964. I'm only a few years younger than you, but just enough to be out of sink. However, I can say this while I was there, I started surfing in 1963, and it truly changed my life.
Regarding your choice to sail in 40-50 degrees F, I have to admit that that's a bit out of my range. However, those kind of statics don't exist in the Central/Southern California area (thank goodness).
Nevertheless, I admire your tenacity and dedication. Your yearly days sailed might be down in 2007, but I don't doubt your dedication and focus.