Listen to this:
=IF=>We raised retirement age to let's say 80 years
=then=> Only those with a life expectancy bigger than 80 would recieve
their well-earned pension and spend the rest of their lives peacefully
=then=> They would have more leisure to spend taking care of their
grand-children
=then=> The burden of taking care of their grand-children would be
smaller to their children
=then=> Their children would be capable of having more offsprings and\or
spend more time on their career and\or paying more attention to their
offsprings.
=then=> Those offsprings (the 80+'s grandchildren) would obtain a
dominant evolutionary position.
=then=> Possible genetic causes for long life expectancy would obtain a
dominant position
=then=> Average life expectancy would pass the 80
=then=> We'd raise retirement age to 90.
and so on.
BUT
=IF=> Unemployed 80+s require extensive supervision of their children
=then=> Their children would be more busy taking care of them
=then=> Their children would have less resources to spend on their own
offsprings
=then=> Those offsprings would obtain an inferior evolutionary position
=then=> Forget it.
How about that?
Lior.