How short should life expectancy be to consider 12 years as "forever"? 35? As in, you grow up and got 12-ish years to live? By the way, Kenya's life expectancy

How short should life expectancy be to consider 12 years as "forever"? 35? As in, you grow up and got 12-ish years to live? By the way, Kenya's life expectancy is over 60, varies from source to source. One could argue that this is life expectancy for people born today and older generations have it much shorter. But it was over 50 since late 60s! I'm pretty sure 20-something expecting to live to 50 or 60 do not consider 12 years as "forever". Nor do 40-something who expects to beat the statistics. https://www.theguardian.com/global-development/datablog/2013/dec/12/kenya-how-changed-independence-data https://www.theguardian.com/global-development/datablog/2013...