In the article linked below, Canadian researchers claim to have found statistical evidence that " ... exposure to pandemic influenza early in life is a risk factor for mortality during subsequent cross-strain pandemics."
They claim they have uncovered data which shows that, for example, "... in 1918 and 1968 ... there were higher death rates among those born during previous pandemic years in 1890 and 1918, respectively."
Their claim thus implies that people alive now who were born during relatively recent flu pandemics, such as " ... the 1957 H2N2 Asian Flu, the 1968 H3N2 "Hong Kong Flu", the 1977 Russian Flu and the 2009 H1N1 Swine Flu" may have a greater mortality risk from COVID-19 today, at least statistically speaking.
The authors offer no theories as to why this may be true, only that "more research" is needed to confirm this, or else to show that it's only some kind of statistical anomaly.
But if there really is something to it, then people born in the years noted above might want to be aware of it.
https://www.infectioncontroltoday.com/influenza/previous-influenza-virus-exposures-enhance-susceptibility-another-flu-pandemic