Exchange rate for gold is even worse. Bitcoins are actually scarcer than gold.
What will happen with gold if one government will start buying all of it? The price will skyrocket, it's one of reasons why modern economic systems switched away from gold based currencies.
Marriage is a construct we inherited from ancient times, back then it helped raising kids, now we have a different situation and incentives should be provided to the model families with kids, not to everybody.
It's from social point of view, but from biological point of view women must give birth before 25 years.
With age birth is more difficult and risk of genetic disease is greater.