As a younger man I never really was worried about having children. My wife and I never really expressed even a future desire to raise a family.
Our first child was not planned but I am eternally grateful to drunken passion that we did start down the road of raising a family.
Now, with a lovely family, I could not imagine facing the latter half of my life without the joy of having children. The thought of simply having memories to look back in my old age, rather than being able to consider the hopes, aspirations and future achievements of my kids and, hopefully, their kids seems a less positive way of approaching those final years.
Of course, not everyone can have a family but to have made the choice simply because you thought the end of world was coming and you would do it in the paradise is a crying shame.