Dr. Laura Corio, a New York City obstetrician/gynecologist, said in her experience, "If you are a good father before, you'll be a good father again."
"I have a couple and she's younger and he's older, with children from a first marriage," said Corio. "He was a bit more involved."
But another one of her patients complains that her older husband "won't even change a diaper because it's her baby."
In Arthur Schwartz's case, the babies were "less of a mystery" in his second marriage.
Unlike his older children, Schwartz's younger ones have a mother who stays home more and she insists he be home weekends and before the children's bedtime.
"I have a routine with one of my daughters that includes singing the same song every night -- 'Go to Sleep, Devin, Go to Sleep.' I do a bit of scratching of her back and sit in a chair in her room for 10 minutes before she falls asleep," he said.
Schwartz also attends his girls' competitive gymnastic meets and spends "more quality time" with them.
But as young as his children make him feel, Schwartz said he still worries about his advanced age.
"I have already had quad bypass, so I know how fragile life is," he said. "My mom is still around however. She works in my office and she is 90, so I have some good genes."