It is estimated that about 12% of Romans that survived first 10 years of life (half of them died before that, but cest la vie if you don't have vaccines and ant

It is estimated that about 12% of Romans that survived first 10 years of life (half of them died before that, but cest la vie if you don't have vaccines and antibiotics) lived to be 70 years or older. Currently, this figure is 43% worldwide from birth. But fertility is also way lower as a response to low infant and child mortality. So 3.5x increase in over-70 population seems a decent guesstimate. In developed countries even more.