Addendum to my above thought,

Roseburia also seems to correlate with longevity;

The Gut Microbiome, Aging, and Longevity: A Systematic Review - https://pmc.ncbi.nlm.nih.gov/articles/PMC7762384/

Deep insights into the gut microbial community of extreme longevity in south Chinese centenarians by ultra-deep metagenomics and large-scale culturomics - https://www.nature.com/articles/s41522-022-00282-3