In September 2019, the mayor of Fukuoka, Japan, made a pilgrimage to see Kane Tanaka at her nursing home. She was 116 years old then and fielded questions from a gaggle of reporters with the cocky confidence of a prizefighter. What, they asked, was the secret to living so long?
The risks here for older people are frightening: A rate of 0.45 percent, for instance, translates into roughly a 1 in 220 chance of death for a vaccinated 75-year-old woman who contracts Covid. If the risks remain near these levels with Omicron, they could lead to tens of thousands of