Be careful of what you wish for. The Spanish flu of 1918 was disproportionately fatal to younger people. The next pathogen may be the same. Covid-19 may predispose younger people for future complications from, say influenza, pneumonia, and bacterial infections, because of damage caused from Covid-19.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3734171/Using historical records from Canada and the U.S., we report a peak of mortality at the exact age of 28 during the pandemic [Spanish flu] and argue that this increased mortality resulted from an early life exposure to influenza during the previous Russian flu pandemic of 1889-90. We posit that in specific instances, development of immunological memory to an influenza virus strain in early life may lead to a dysregulated immune response to antigenically novel strains encountered in later life, thereby increasing the risk of death. Exposure during critical periods of development could also create holes in the T cell repertoire and impair fetal maturation in general, thereby increasing mortality from infectious diseases later in life.