Maybe draw the line at 65, typical retirement age. Then the people staying home are least likely to be in the workforce.
I am nearing 66. Still working 4-5 days a week making bulk livestock feed deliveries into 3-5 states. 2500 miles a week. I get out at each end of the run around an hour there. Go through some to me big cities/towns without stopping. I eat at home. Somebody has to do this, this is for animals in captivity that will be in freezers for us at some point and we have younger drivers refusing to go. Wash your hands with hot soapy water at every stop at least once!
Allow them to draw their SS now for a few months during the outbreak, without any penalty & then just delay their retirement date later. Esp. Self employed or those who have no option to work from home.