Lots of young EAs are struggling with the issue of whether, when, where, and how to have kids, and whether becoming a parent will undermine being an Effective Altruist, in terms of opportunities costs such as career, time, energy, money, focus, and values.
For whatever it's worth, I'm happy to answer any questions you might have about parenting -- its pros and cons, ethics, practicalities, etc.
Background: I'm a 57-year-old dad; I've raised a 26-year-old daughter and a 6-month-old baby. I've also helped raise a teenage step-son, and I come from a big, close-knit family (I have about 30 cousins.) I've lived as a parent in the US (mostly), UK, and Australia. I'm also a psychology professor who's taught courses on parenting-relevant topics such as behavior genetics, educational psychology, evolutionary psychology, human intelligence, evolutionary game theory, and decision making. I've been involved in EA for the last 6 years, and I have a pronatalist orientation, with an interest in population ethics, reproductive bioethics, gamete donation, and cognitive and moral enhancement. I'm not an expert on every practical or scientific issue about parenting, but maybe my perspective could be useful to some EAs.
Jeff -- yes! I think that effect is actually more important than the concerns that people often have about whether they'll be too tired to be good parents in their 40s or 50s. If people stay in good physical shape, it's honestly not that hard to have the energy for parenting in middle age (speaking as a 57-year-old with a baby).
However, I'll be 75 when my baby graduates high school, and maybe 83 by the time she has kids of her own.
Hopefully longevity interventions and regenerative medicine will help us all live long enough to meet our great-great-great-grandkids. But until then, having kids younger means you'll get to spend a much higher proportion of life enjoying their company, and being around for future grandkids.