I'm in my 50s (feel 30s still Thank God) but in my lifetime, I've had many colds. My climate helps it. Long winters.
I think in my lifetime I've had what I would class as full blown Flu about 3 times. I mean they grounded me. No just coughing, not just nose and head blockage issues (cold) but totally drained of energy, weak, pains, headaches. The full gamut. Three times. And they aren't fun. Never were. I think twice they gave me warning that they were coming. But one just hit me like a brick out of nowhere. One moment I was absolutely fine. The next, I just couldn't think straight and couldn't even sit up. It just took over my system like a drug. Most frightening one by far.
But I also know someone whose heart completely failed due to effects of a flu. Had lots of surgery to get him right again. But said he got a flu and it all went downhill from there quickly.
But my point is to agree with you. Younger people especially, who might still not have suffered a major flu, have to realise that 'normal' flus can be devastating, can attack weak systems, can really weaken and compromise strong systems and can most definitely kill.
In that regard, Covid 19, if real, and even if criminally manufactured, is a Flu in its effects. And in terms of repeated figures worldwide for mortality rates, it seems to kill the same percentage as a 'normal' Flu season would. When I was hit by my biggest one to date - yep, it was scary the intensity and the suddenness. But no, the world wasn't stopped. It passed through, it forced all our immune systems to adapt. It was a tiny Natural part of our continuing evolution.
Of course the vaccine boys want to, like everything else, artificialise evolution - manipulate it, control it. And they're the ones that would be also part of the climate change agenda, that blames man for playing Frankenstein with the Natural world. Hypocrites.