An MO that lives to 26 years in 2019 can expect to live for another 60 - 65 years, reaching a mean life expectancy of 91 years.

This may be a conservative estimate as improvement in heathcare may enable him to cross 100 mark

Caveats include global warming, droughts, crop failures, new epidemics which can reduce expectancy markedly.

If such disaster occur perhaps a projected Total lifespan of 40-50 years is more accurate.