.@​bryan_johnson believes wound healing could be a useful biomarker for biological age because it's difficult to "optimize your way out of it." "It's a pure re

.@​bryan_johnson believes wound healing could be a useful biomarker for biological age because it's difficult to "optimize your way out of it." "It's a pure representation of capacity. You can lift weights in the gym. But what does your body function by default?" "This is why I measure nighttime e…