I'm a runner, about 15 to 30 miles a week, depending on how busy my work schedule is and if I am at home or on the road. I'm 50 years old. I run in Vibram five fingers. I've been doing it now since 2007 with no running related injuries.
Cardude, and the others that say jogging/running is hard on the joints, that is old school thinking that is not based on any sort of fact. Most modern studies actually show that running is good for your knees.
If 2 to 3 miles is tough on your feet and knees, you should consider trying some simple exercises to strengthen your lower extremities. Stand on a step with your heels hanging over the edge and lift up onto your toes. Do 25 reps before and after you run. Do 20 squats twice a week, keeping your knees behind your shoe laces. Stand barefoot on an old towel and wad it up with your toes.
Get someone to look at your form and give you some pointers. That does NOT mean to go to your local running store and run on the treadmill while they video your feet. Look for a coach. Or, here is a great site.
Dr. Nick's Running Blog - Running injuries, foot pain, shoes, heel pain - Your source for all running related questions!
Then ditch your big stiff shoes that some shoe company with a vested interest told you were the latest, greatest thing.
Over time, arch support makes your feet weak and should only be used while you are rehabbing an injury. Too much cushioning makes a shoe unstable causing twisting which IS hard on the knees.
Gradually transition into as light/thin/flexible shoe as you can. It's tough in the beginning but oh so worth it in the end.
This unsolicited advice holds true for all you walkers out there as well, it's just not as critical.
I'll get off my soapbox now. Thanks for listening, I hope I helped at least one person.