This is really good information. The numbers that everyone is giving here I am comfortable with. I have been doing fine on my unburdened day hikes around here so far and don't have any serious health issues at this time. I will do a couple of longer day hikes with a pack on my back to see how it affects me. But it sounds like I can reasonably expect to cover 10 to 12 miles a day, maybe a tad more on easy terrain.

Pika, I sure hope I am still able to do what you are doing when I get a few more years on me.