Nonsense. Elton has been with David for twenty years. If parenthood was such a pressing commitment for either of them it could have happened when they were both young enough to see a child through to adulthood. This isn't about 'circumstance' but the choices they have made.
Actually, no. I think Elton was a big selfish self-involved baby himself until relatively recently. He has more or less said this about himself in interviews over the years. Surely it's good that he didn't go down that route until he gained 'maturity' himself?
I just see two really happy people thrilled to bits with late fatherhood.