How old were you when you had children?

I’m so sorry if this is personal to ask. But I came up with a year to have a child and decided that I will stick to birth control until then because I want to plan my pregnancy and not “be prepared” because no one’s “prepared” but be knowledgeable and understanding of the child birth process and understand it will not be easy to raise a child, not only financially but mentally and physically. I decided the age 30, is this a good age or am I doomed? I heard that after 35 or so you stop producing and your chances of fertility decrease and I want three children maybe four max. But I don’t want to come to a point where I cannot continue being a mother due to my age. So it scares me and makes me feel like I have to get pregnant in my 20s.