I'm 30 and have 2. I can't imagine going through raising children any older than I already am. If anything I feel like we waited too long. My oldest is 2. As much as my children are my world, there are things you're not equipped to handle as well I'm your older age. It would be sad to not be able to participate in my son's extra circulars that require physical strength and endurance. Just one example. But I would say it's never too late if you don't have any children at all. Everybody should try to have kids. I'm just saying of you already have some, 35 is a good place to try to be done by. That way you can maybe have great grandchildren one day and they will know you. Also, you can enjoy your retirement with your adult children and help them come into adulthood with less on your own plate.