The issue is that you are not the same person 30 years later. I am not the same person I was before I had kids. What am I regretting? I find the premise here

The issue is that you are not the same person 30 years later. I am not the same person I was before I had kids. What am I regretting? I find the premise here based upon the idea that there is some magical set of choices you can make to have the perfect life and regret is assessing your delta from that perfect life. The whole concept seems flawed.