I am in my late 50s and not regretting it. Not having children has made my husband and I save more for retirement. As a nurse, I see way too often elderly patients whose children are not around, they live in a different state or just dont bother to visit.
As much joy and travail that having kids caused me, it was always worth it.
That joy is exponentially magnified when I am in the presence of my grandchildren. They have enhanced my life to such a degree that it is literally inexpressible.
Not knocking you for your choices, but I am reveling in mine.
I could not be happier than I am when I am near them.