There are lots of tradeoffs. On the one hand yes, maybe it means the kids will be out of the house before you start having to deal with parents. On the other hand it's quite likely to be bad financially, as in many cases you'll be down to one income and slower growth in that income during those critical 20s and 30s. That can leave you a bit strapped when you have to pay for college costs and parental-care costs and eventually your own retirement. I had my daughter at 39 and retired at 55. Without that last 10 years of income from my wife and rapid income growth for me, plus the magic of compound interest, I'm pretty sure I'd still be working and none of us would be any happier for it.
It's all very personal, obviously, which is precisely why I don't think one can (or should) generalize about an ideal age to have children.