if 12*(lifeexpectancy@80) > lifeexpectancy@20 and if (20 year old will commit suicide due to poverty or depression) then 12 oldies get to die.
That sort of reasoning is faulty in so many ways that it would be bothersome to work out all the various ways but let's start off with the assumption that those 12 people are not just as eager to live a few more years and that those last few years may be more precious to them and those around them than a 20 year old that may or may not commit suicide.
This sort of cold-hearted calculus is not going to solve anything at all, merely create rifts by polarizing what it means to be 'young', 'old', 'suicide prone', 'depressed' and 'suddenly poor'.
Being 'suddenly poor' is really hard in Sweden by the way.
There are many reasons why death rates increase with economic hardship and I do not think this is a significant one. More significant are changes to factors which are already leading causes of death (cancer and heart disease). In the short term, examples are how many treatable cancers are not being found or how many people are skipping other medical procedures. In the long term, how many life-years would have been saved with tax money which is lost. Even with socialized medicine, countries have budgets which need to balanced, and not every procedure is available to everyone who could benefit.
This study [1] estimated 260,000 extra deaths from treatable cancers from 2008 to 2010 in the OECD. One should ask how will this scale when additional diseases are considered and how the current economic impact will compare.
I'm not saying that I know what the correct choice is here, and perhaps we will never know, but it isn't as simple as saving lives vs suicide.
[1] https://www.thelancet.com/journals/lancet/article/PIIS0140-6...
Unfortunately, the pubic ( at least in the US) is dividing into camps which largely ignore this fundamental question. Either any action which which increases covid deaths is amoral, or the economy should be the primary concern. In reality, the real question of how to optimize quality adjusted life years has been squeezed out of the conversation.
However "cold" the reasoning is, it doesn't change the fact that there are people who'll die decades earlier now than they otherwise would have without the lockdown. I don't see how sixty years of a young person's life is worth any less than 60 years of multiple old people's lives; the only difference is that it's easier to see the direct consequences (old people dying now) than the consequences that take years to materialise. Ignoring and not measuring second-order consequences isn't warm, it's stupid.
It's easier if rather than "lives saved", you look at "life years saved". In this sense, somebody in their 80s who only has a couple of years left dying early is equivalent to the situation of a young adult being pushed into poverty by the lockdowns and never managing to recover a middle-class lifestyle, so they die a couple years earlier (I'm not sure about Sweden, but in English speaking countries poor people on average die a few years earlier). A 20-year-old commiting suicide due to sudden poverty, or depression from being locked inside, is equivalent to twelve 80-year-olds who have five years to live dying early.