The severity of covid is basically determined by the amount of virus you have in your body by day 5 to 7 of symptoms, which is very much a affected by the rapidity/effectiveness of your immune response, which is of course largely a function of age, underlying health issues like obesity, nutritional deficiencies... But also inititial viral exposure. Because viral growth has an exponential growth rate in the absence of an immune response. So whether you inhale 1000 or 50,000 virions will have a great impact on what the quantity of the viral load is 10 days after exposure. Your health may determine whether you mount an effective immune response at day 5 or day 8 (which is, I assume, a linear or maybe logarithmic function). But if that response happens after the exponential growth of the virus has passed an inflection point you are fucked. Whether you are 6 or 60. That exponential function value is determined by inital population of virus at exposure. You can kill ANYONE in any state of health with this virus or even its spike protein alone (as vaccine has demonstrated) with high numbers of virions. A very high quantity of virus at initial exposure will result in a lethal dose of sars cov 2 before even a young healthy immune system can respond. The outcome of a sars infection is just a math equation. You plug in parameters and get a result— mild, moderate, severe. There are old farts who had a mild case and think they have a great immune system because they fought off covid. They probably had a low exposure. Other younger, healthier, middleaged people died because of the initial viral load. This is basically how all infection disease works. People who have observed mild cases of covid misinterpret it as a mild “cold” because they lack information about how infection works. Math not magic. Here’s another math lesson: Your life mean expectancy at age 0 is 78 or something like that, but it isn’t your mean life expectancy at 78. At that point it is around 88. The mode and median life expectancies are much higher than the mean of 78 because death is a massively left skewed curve and not a normal (bell shaped) distribution. So citing the mean age of death as some point at which an old person with covid “should die” is just retarded. If 78 year olds all die when they catch covid, you are fucking up the life expectancy curve of 78 year olds which means you are fucking up the life expectacy curve of EVERYBODY since everybody includes 78 year old which means that the mean life expectancy is now no longer 78 but LESS than 78. Do you get that? Do you get that if the mean life expectancy is 78 and you kill off all people over 78, that the mean life expectancy is now lower than 78? Is that too complicated a concept to grasp? https://i.stack.imgur.com/TOsq9.png Most common age of death is the mode which is 88. Mean is 78. Get it? Hey commander, math ability isn’t always predicted by sex, is it?