You're doing fine. I'm 50 and a clyde, and took up riding for the first time since i was a teen riding BMX. I started by riding 3 houses away...and I'm up to about 3k. I can't wait to get up to about 10k and ride to my local metro park and camp out for the night.
at least that's my crazy plan. What's the worst that can happen? I"m sure the other campers won't let me starve to death laying there with a broken leg