I believe it. When you’ve had a healthy reproductive system all your life, it just keeps going. I don’t believe any of the statistics about age. They don’t have enough women or men with unaltered fertility to do real studies.
Plenty of Jewish, Mormon, Muslim and Catholics (like the Quiverfull movement) that demonstrate this. Fertility rates drop off in the 30s and the odds of prematurity, stillbirth and birth defects go up.