Longevity

Cognitive ageing is not a single slope everyone slides down at the same rate. Decades of research point to cognitive reserve — the buffer built by education, sustained learning, movement, sleep and social engagement — as the strongest modifiable factor in how well thinking holds up over time.

This pillar covers what the long-horizon evidence supports and, just as importantly, where it stops. Prevention research is genuinely promising and routinely oversold; we try to keep the two apart.