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I'll disagree about age. At 23, the pre-frontal cortex is still developing and won't be finished until around 25.
It's responsible for:
There is a distinct imbalance between someone in their 60's and someone in their early 20's. I'm not saying it can't be carefully and respectfully navigated, but it has to be acknowledged and accounted for.
It doesn't sound like that happened here.
Then we have the power dynamic of a celebrity who is also your employer. Add in a healthy dose of fictive kinship due to the live-in nature of a nanny and you're in a situation rife with the potential for abuse.
IIRC, that study didn't conclude it stopped at 25, it expected it to stop at 18, but it kept going, and they ran out of funding at 25. A likely conclusion is that it never really stops, it's just that what was measured wasn't really development, but "change".
Okay, source it if you've got it, because the idea that a single study ran out of funding at 25 and that's where the number comes from is such an odd suggestion, as though no one else has studied the brain's development and neuroscientists everywhere just shrugged and thought, "if only the funding were there."
Here's a well-sourced article that concludes the brain continues to develop well into the mid-20's.
While the brain will always continue to develop and grow, due to neuroplasticity, the concern is whether or not the prefrontal cortex, the part of the brain responsible for long-term decision making, is properly developed. This development continues into the mid-20's and is well-documented.
Here's a 2022 study where they looked at over 100,000 brain scans from people 110 days old to over 100 years old used to draw and affirm similar conclusions.
While 25 isn't magic number, as everyone's brains develop on different timelines, it is a rational and reasonable landmark that can be reliably used for broad discussions.
Here's more from the National Institute of Mental Health and Penn Medicine.
Looking through it now, I believe the conversation I was in was referencing this: https://www.nature.com/articles/npp2014236 , specifically because it's not a random group of scans. It's a rather ambitious study, from 1989, and is, as it was told to me, where the journos got ahold of the "25" number. In fact, the first article you link's sources seem to all have the 1999 version as their first reference, probably because they're all pre-2014. No mention of money in the paper, obviously, but it does talk of the study as "ongoing", and I couldn't find a newer followup, so, uh, yeah.
As I was digging, though, I ran into this: https://www.nature.com/articles/s41467-023-42540-8 , so the number you go with, if it even makes sense to go with a number, is still a matter of what you want to measure, I'd say.
Not sure how exactly your sources are measuring “development”, but at the age of 41 I know for a fact I still have prefrontal neurogenesis happening. I still have neuroplasticity, etc. My brain’s not going to stop developing until I’m dead.
That's neuroplasticity, which is true.
Right, so do you know how your sources are differentiating “development” from “neuroplasticity”?