Newborns keep you up but an all-nighter is a stretch. Also, you're looking after your kid and trying to get them to sleep, not trying to churn out code to get something to market/go to prod.

Both of mine had colic and went through difficult teething. I've pulled all-nighters to deliver something and it's much easier than several weeks of sleepless nights with an infant.

Yeah true getting sick at that age is rough.

A sick kid will absolutely keep you up all night, and kids love germs, so they get sick a lot

My youngest was born when I was 47. He’s now 9. I also have a 13 yr born when I was 43. I’m tired but I don’t think it’s from the kids. (More I’m tired of working - been burning the candle at both ends for nearly 40 years.) The biggest difference of having kids at this age is that I don’t have time to myself or for myself like other parents around me so are by now empty nesters or close.

I always needed more than 8 hrs of sleep, now that I am into my 50s, I feel well after 4 hours. Anecdotes are good. My grandfather got to 100 not sleeping more than a few hours a night after he turned 55 and he raised my cousins as their parents were shite. I know whining young parents who complain about lack of sleep, I know older parents who never do as they were happy finally having a kid. Etc.