Herb Townsend will be 85 in a couple of months, and he's still running about 35 miles a week--an impressive amount. His secret might be that he trains at a slower pace than most, as slow as 20:00/per mile. At the same time, he can still crank 12:00s if he decides to enter a 5K race. "I feel cheated if something (like travel or illness) prevents me from having my daily run," says Townsend, who splits his time between Ocean City, NJ, and Naples, FL. "Maybe it is an addiction, but considering the associated health and fitness benefits, I consider running to be a positive addiction."