Some people age slower on the inside. New research uncovers a blood‑chemistry fingerprint in centenarians that hints at more resilient, youthful biology.  

Rare immature neurons in very old brains seem to switch on survival and repair programs, helping some people stay sharp even when their tissue shows heavy aging changes.  

Old muscle stem cells slow repair on purpose, using a protein brake to survive harsh conditions—so simply making them “young” again may burn out the reserve.  

LDL measures cholesterol cargo; apoB counts the actual particle “traffic” that drives plaque, making it a sharper, longevity‑friendly guide for treatment intensity.