I used to think that was far too young - for me anyway, as was working hard in professional career and enjoying travelling etc at that age.
Having delayed motherhood until 38 and 39y, I now wish ( in my late 40’s) that I had started a family much earlier - I think would have had more energy, and far less worries about staying healthy and being still around to support my children as they are older. Partly as did not meet dh until 30’s - but we didn’t hurry, to say the least!
I also had a rather unrealistic idea that once I had reached senior level in career, then we would have sufficient funds for childcare and less pressure in children and work clashing....can’t think why, as this has not been the case at all.
My parents had me at similar late age, which has meant my children only knowing elderly, unwell 2 grandparents, and the others dying before they were born. It’s also led to me having the worst possible combination of ridiculously busy and high pressure job, small children, elderly/ill parents (who live 50 miles away) to partly care for...and the menopause to deal with all at the same time...
I will be strongly encouraging my children (esp dd) to consider mid-20’s if they do want a family. My sister did this and has certainly had a much better quality of life and more time with her children when young than me.
Appreciate my situation may not apply to everyone, and that some have later families due to fertilty issues etc.