Those fellas should stay home if they don't feel up to going to work.
I see folks "in their 60's" at work every day in/at the grocery store, Home Depot, Lowes, Costco, the corner convenience store, the Post Office, the drug store, the doctor's office, the cigar store, the liquor store, the golf course, the Ford dealership, etc...
...assumption of risk is a personal decision that every person makes on a daily basis --- are you in a position to tell others that you know what's best for them, better than they themselves know what's in their best interests?