Bryan Johnson@bryan_johnson• 4 months ago

The body can just do things. Always rebuilding. Immune cells: hours Small-intestine lining: 3-5 days Stomach lining: 3-6 days Taste-bud cells: 10 days Skin epidermis: 1 month Red blood cells: 120 days Liver cells: 1 year Fat cells: 10 years Skeleton: 10 years Brain neurons: lifetime