Expected lifetime of those who were born during the war decreased relative to previous and following generations.

Finland had a famine 1867-1868. After that expected lifetime started to increase. There was a dip in generations born around civil war and then again during the Winter War and WWII. After that life expectancy continued to increase.

Source: Expected lifetime of population by year of birth. https://www.stat.fi/org/tilastokeskus/elinajanodote.html