Well they limited terms after FDR, perhaps if Biden does die they will have an upper age limit just as we have a lower age limit. Eligible to run for president between the ages of 36 and 66. After all there are lots of government jobs that force early retirement. I think the same should apply to all Elected officials, or do away with all mandatory retirement age regulations. No man or woman should be above the law and all politicians place themselves above the law by not having to retire. All judges should also be retired at age 66.