It was great in my 20s. Worked, made friendships, went out dancing, travelled relatively lightly, read, went to concerts, met so many different people, went to many different places and events. Read in bed, had daytime baths, could drop everything if a good offer turned up, like sporting events half way across the country.
We have two teens now, older and apparently wiser. And at some point they will leave and it will be both of us again, bit different as will still need to earn to save for pension and their education, house deposit etc etc.
I am so glad my 20s were childfree, there were so many other childfree young adults around it was fun, social, busy, I just wouldn't have had that energy in my 40s if we had had children younger. I have advised our teens to have their 20s childfree, because you are a long time parent, whilst others are childfree and you have no health issues, a skeleton that can dance, run, travel in tight spaces, wake up with smooth skin and ok hair.
Don't get me wrong we adore our kids we had in our 30s, they bring joy, fun and happiness, as well as expense, stress and frustration, but not once did I resent them or felt I was missing out because we had done most of what we wanted to, we were already at the stay in at the weekend with a roast and tv stage when the kids came along.
But different people chose different paths, you will be done by 40 ish and can embrace the freedom where others will still be on the school run. You might even be on the grandchildren stage as other's kids are leaving for university.
There are plus and minuses to every decisions. For us having kids a bit later was better, for both of us, all of us. This is just on set of experiences and opinions in a sea of thousands.