Is it selfish to choose not to have kids?

I'm the oldest of 3, and I'm watching what it actually takes to keep our parents going now that they're in their 70s. Doctor runs, insurance calls, somebody to check the furnace, somebody to sit in the hospital waiting room. We split it and it still eats whole weekends. That's the part I can't get past in this debate. A lot of people opting out are still counting on a world full of nurses, teachers, home health aides, and somebody's kid to fix the roof in 2055. Those people don't appear out of nowhere. Somebody has to do the long, unpaid work of raising them. You can choose that life, obviously. Just don't tell me it's the generous option. Keeping all your time and money pointed at yourself is a choice plenty of people make. Somebody still has to raise the people who'll be running the hospital when we're the ones in the beds.