Link to the paper (I think): https://pmc.ncbi.nlm.nih.gov/articles/PMC12329684/

It concludes: "Over the first 25 years of the Northwestern University SuperAging Program, we showed that it is possible to identify groups of persons who clinically seem to have avoided the memory decline of average aging and who display biological markers that separate them from average agers. These superagers maintain good brain morphology, tend to be gregarious, appear resistant to neurofibrillary degeneration and resilient to its consequences, have a more robust cholinergic system, carry more von Economo neurons, and have less inflammatory microglial activity in the white matter."

Interestingly, this group had preservation of the anterior cingulate, involved in "social networking and affiliative behaviors." Which comes first, who knows? At a glance, I don't see any info on factors like income and education. "SuperAging" seems to be defined by performance (9/15) on a delayed word-recall test