I haven't had the flu since 1991. I did get a bad lung infection around 2005 that almost killed me, which required surgery and 10 days in the hospital. But other than that, I've had no other down/ill days in the last 31 years.

I believe I have gotten infected with influenza a couple time every year, but the symptoms were 'very' minor and lasted no longer than 4-6 hours. This typically happens when I've visited my grandchildren during the winter months when the flu is pretty common. Those symptoms will come upon me 3 days after I've visited them. All that happens is my temp will rise to about 99°F, I'll feel a little chilled and sore. Then about 4 hours later that will pass and I'll have a runny nose for the remainder of the day. And that's it.

BTW, I've never had a flu shot. No vaccines since 1979. No ongoing health issues other than an occasions sore back. I've had a few sinus infections in the last 10 years that required antibiotics.

I don't even remember what it is like to have the flu except I recall it was difficult to sleep because of plugged sinuses. I'm 65 now btw.