As a mom, with teenagers, there is no good time for babies, ever. There will always be a reason to put off having them. And you can NOT have it all. It just isn't possible. Yes, some people are able to successfully maintain a career and have kids, but somewhere something gives at least little. Missing school events or sporting events occurs even with my job now where I 100% set my own schedule with zero supervision. Sometimes things just come up that can't be avoided. If you want children then you need to understand that your life will be much different than without. Your personal life will be different, your career will be different. Not bad, just different. Mommy track is not bad, just different. I chose to have my career later after my children were teenagers and nearly out of the house. That required that I have my first at 21. My husband was on board, but I have given up huge in terms of length of career and possible (likely) age discrimination once out of school. Like I said, somewhere something gives at least a little.
As far as having babies when you are older. It is possible and common. There are several prenatal tests that women over 35 have that help determine birth defects which can either allow them to prepare themselves for a disabled child or end the pregnancy. Not pleasant to think about, but true. If you are going to wait for children, wonderful! Just don't expect it to be easy and you will be fine.