Woman’s 体质 will get worse after 50. I can understand if this is the first kid. However, it is not the same thing “这就跟卖保险,不能因为年纪大了,风险增大,就不卖保险了吧”.
You can decide how many and when you can have the kids, kids can’t make decides. From that point, you need to make sure you have the capability to give a healthy and happy life to them. This is fair to both mom and kids.