Don Pellman, age 99, did the high jump in college, but gave it up for the next 58 years. Then after retirement he decided to get back into track and field.

He went on to win four U.S. track records in his age group (high jump, long jump, discus, and pole vault - including one at age 95) and set four world records.

"You have to keep training 365 days a year," he says. "I do something every day, if nothing but long, brisk walks."

Clearly, he's living proof that researchers from the University of South Carolina have got it right. They found that older folks need to use it to lose it and move it or gain it — weight, that is.

Looking at the habits of 4,999 adults ages 20 to 70, they found that most seniors improve their diet by opting for more veggies and leaner proteins, but they still gain a lot of life-shortening weight (35 percent of seniors are obese).

The culprit, the researchers say, is a precipitous decline in physical activity. Less than 7.25 percent of adults 60 to 69 and 8.5 percent of those 70 or older get the recommended minimum 150 minutes of weekly activity.

But listen up, advancing agers: You can turn back the clock by adopting a walking routine (aim for 10,000 steps a day or the equivalent —one minute of aerobic activity equals 100 steps) and doing strength training twice a week.

Maybe taking that short jump to better health will inspire you to try a long jump, too!