Re: A new obsession?
I'm a firm advocate of disc brakes. They are by far superior to any other type. I'm assuming you have coaster brakes now. You'll get lots of opinions on coasters. I run two of my bikes with rear coasters and front disc. Stopping is never a problem.
You might need to do some fabrication to get disc to work/fit on your fork but it can be done. A front wheel or at least the hub should have provisions for mounting the rotor.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"