Before we started getting flu shots, one or another of us got it at least every other year. Last year without one all 3 of us, at the time, had it at same time. Fun times. We have gotten flu shots every years since them, 1988?, and as wife and I got older we got the pneumonia shots as well. No side effects to either.
When I got the cancer diagnosis in September, one of the first questions was if I had had the flu/pneumonia shots, Yep, and still get asked it often. Oh, grown kids who don't get the shot: get the flu. Grandson has it for the second time this year now.