From my own experience, I can only recommend to start early with having children. I was late to the party. This has a lot of disadvantages. Most likely, you are not as fit anymore, if you are older. If you have kids, you have to be fit to have a lot of fun frolicking with them. In addition, the grandparents are not that old and can spend quite a few years with their grandchildren, which should be benefial for both parties.
From my own experience, I can only recommend to start early with having children. I was late to the party. This has a lot of disadvantages. Most likely, you are not as fit anymore, if you are older. If you have kids, you have to be fit to have a lot of fun frolicking with them. In addition, the grandparents are not that old and can spend quite a few years with their grandchildren, which should be benefial for both parties.