I worry about my T, since he'll be 60 years old this year. When I told him, he volunteered some information about himself to show me that he's probably not that much at risk, though aware of the fact that he should take extra care.
I'm less worried about my parents since they're younger and my mom has extensive medical training as well, so I feel she can keep them safe. My grandparents are the people most at risk from those that I care for, but with them I didn't expect them to be around much longer anyways, so it's not that anxiety inducing.