Every year, the elderly get sicker, get new sicknesses, die from the new bugs introduced into their systems. Leave them well enough alone.
They young can handle the germs that are introduced into your body.
Most old folks don't die directly from the shots, but die from complications from the shot including pnumonia, added load to the immune system (that is already weak and suspect), and results from being more sick than they already are.
Leave them alone.