I want to start by acknowledging that's a totally legitimate perspective.

I'm curious though - do you think you'd be fine with only doing walks and TV for 40+ hours a week? Personally I got interested in computers and programming very early, and at first it was 100% a leisure activity. It stayed at roughly that level of exciting for me until probably 6 months to a year into being employed as a developer, but it's no longer the #1 thing I like to do when I'm not at work. My current situation is work with a side of typical relaxation (watch tv, browse the internet, etc.), but I expect when I eventually retire I'll start spending a bunch of leisure time on programming and general messing-with-computers stuff again.