You don't have to be in the elderly demographic to be immuno compromised or to have serious underlying health conditions.
My DH has had cancer since his early 50s, so everyone in our family practices good hygiene to protect him, as if we catch something, we're highly likely to pass it to him simply by being in the same house. That means not shaking hands, washing hands constantly throughout the day, using hand sanitiser after touching door handles or handrails, or money, etc. No one comes into our home unless absolutely necessary, other than friends and family who know about his condition and respect good hygiene practices themselves.
He says the "only" place he's ever felt "safe" was on a cruise ship due to the precautions, facilities, etc - even there, we didn't let the stewards/cleaners into the cabin, didn't go to the busy restaurants at busy times, etc, but it was an absolute pleasure to see the hand gel stations everywhere, automatic doors, etc.
The place he feels least safe is the GP surgery and our local hospital where no one appears to practice good hygiene and where even the toilets often have empty soap dispensers, etc. We often say it's no surprise at all that viruses sweep through hospital wards in Winter, such as norovirus, c-diff etc as the staff basically ignore airborne viruses and anything they can't see i.e. clear fluids - they're obsessed with blood and will clean it immediately, but aren't remotely interested in touch points, airborne, etc. When we were last in the out patients waiting room, there was a cleaner going round wiping the door handles and light switches, but he was doing it with a dry duster - utterly useless and pointless as you need some kind of cleaning fluid or at least an Anti-Bac wet wipe - it was just to give the impression that things were being cleaned.