But like many diseases, the coronavirus is far more sensitive--the IFR for a 75-year-old is >100x that of a 25-year-old[1]. That's the reason why health care spending is near-universally assessed by cost per quality-adjusted life-year (QALY) saved. To do otherwise would yield absurd results, paying the same to restore a dying child to perfect health as to extend a centenarian's life by another month of agony. Around the usual ~$100k per QALY saved and counting both the deaths and loss of quality in severe but non-fatal cases, I believe that masks, social distancing, remote working where possible, and closure of the highest-risk businesses (theaters, nightclubs, etc.) until a vaccine is available are likely cost-effective, but facility closures beyond that are not (except to any extent required to stop the medical system from getting overrun).
1. https://www.thelancet.com/journals/laninf/article/PIIS1473-3...