I really appreciate this poem. I have a two year old and a six month old, and I had no conception of how I committed I would feel to my children until I had them.
I actually took some risks and worked super hard in my mid-20s to mid-30s, prior to having kids. I am so glad I did it then.
Another way to read this post, if you are young, is as a warning - you may think it is scary or hard to take risks now, but go for it. When you have children, it will be much, much harder. Every minute you are working, you will feel torn that you aren't with your kids, and every minute you are with your kids, you will feel torn that you aren't working (to provide for them). If you can use your twenties to gain some financial freedom and control of your time, it is really worth it.
I went through a period of thinking that I had 'wasted' my 20s on hard work, while everyone else was partying/backpacking/skiing/whatever. I now realize that my 20s (and early 30s) were an investment for a vastly better reward - the time and financial freedom to be with my family in my late 30s/early 40s when my children are young. I couldn't be happier with the outcome of those choices, and I didn't really see it coming, because I did not understand the depth of feeling I would have for my children.
But for the young people out there in their 20s - your opportunity cost will never be lower. Go for it. Invest in yourself. Working until 10pm on something you care about won't always be without painful tradeoffs. Forgoing income to try to start something won't always be so easy.