Donna Quaife is 81 years old and had both knees replaced. But she walks on the treadmill an hour a day and still competes in pickleball. Her secret? Play. She's been moving her body for the joy of it since she was 4 and sees no reason to stop "We had a shot-put pit in the backyard. We had a high jump. We had a basketball hoop in the driveway,” Donna Recalls. “I got my first broken nose in the eighth grade — my brother elbowed me playing basketball." Think back. Kick-the-can,