Can anyone explain how they calculate the years of life lost by primarily young people due to shutdown vs the years (or months) of life lost from the very elder

Can anyone explain how they calculate the years of life lost by primarily young people due to shutdown vs the years (or months) of life lost from the very elderly population due to covid? It seems to me that there is also a measure of quality to be taken into account where many of the deceased were in care homes and likely had a very low quality of life already. I am for protecting as much life as possible, economy be damned. But killing the economy seems much more likely to steal many more years of quality life from people than covid is given the current demographics. I'm genuinely curious if anyone has actually run the numbers and talked about this? Overall I feel like all we get are politically charged platitudes (On both sides) and politicians using this to advance their careers.