The Kizelewiczes have also dealt with medical problems, a common issue for couples marrying late in life. Two weeks after the birth of their daughter, David had prostate surgery after being diagnosed with cancer a month before the baby's due date. Years later, he has it under control as a result of the couple's combined efforts to stay on top of appointments and medications, Natalie said.

Otherwise, Natalie no longer feels the age different as much as she used to, she said. David has slowed down a bit, but so has she. Their 7-year-old nephew seems to notice, asking how old David will be when the boy reaches his age.

"He tells him, 'I'm going to live until I'm 100; don't you worry,'" she said.

David also thinks about it sometimes -- when Natalie is 60, he'll be 80.

"Though we have a really good life right now, that's the only thing I kind of worry about," he said. "That's time to come, but so far it's been great. Age hasn't really caught up to us."