55 and change here, working full time. I've been averaging about 5000 mi/year for the past couple of years, so +/- 100 mi/week. My saving grace is commuting. Depending on work-related travel, and days off, I'll commute two to four times per week, about 30 mi round trip. If I only rode on weekends and after work, I doubt I'd do 100 mi/month.