The most COVID deaths were among Americans over age 60, who accounted for 300,000 of the 500,000 U.S. deaths from the disease in its first year. A new study by the Center for Retirement Research finds, not surprisingly, that the oldest survivors of the early months of the pandemic were healthier than those who died from the virus. Taking this into account, the researchers estimated what mortality might look like in a “post-COVID” world in an analysis that was based on a big assumption – that COVID’s deaths were confined to a single year. Factoring in the early impact of the virus, the researchers found that, despite COVID’s tragic toll in the over-60 population, their future mortality would decline only slightly becaus…