That Immune Health bit (above) is something I'd never heard of. Sounds too good to be true- so, queried AI on that and got as follows:

That is a fascinating finding from a study by King's College London and the University of Birmingham.
Researchers found that these older cyclists didn't just have better cardio; their thymus—the organ that produces T-cells for the immune system—wasn't shrinking as it normally does with age. Instead of producing fewer T-cells (which typically happens starting in your 20s), their bodies were churning them out at the same rate as young adults.