I asked you all to provide details but forgot to provide my own !!
I'm 41. I've been bike-commuting for over five years now. My first year was actually during an El Nino cycle. But I stuck it out through the ferocious rains and stuck with it year round. The next year (La Nina) cemented my resolve.
I then moved farther away from work, increasing from a 7 mile one-way trip to about 20 miles. I wasn't ready to take that leap at first so I piggybacked on the "bus" -- my wife driving my kids to school. There I unpacked the bike and headed the 12 or so miles to work.
Going home I would ride to downtown San Jose and then take the light rail home.
Eventually I built up to doing the whole 20-mile trip from home to work and back. Sometimes I'll meet the wife and kids somewhere else. It all depends.
I also do between 70-90 miles per week.