And countries as everybody knows
The answer to this question is Asexual.
Up to this day, many experts still argue whether the cause of asexuality is simply psychological condition that just happen ever since that person born, or whether it's caused by potential damage that happens in our nervous system that drives pleasures when we experience sexual arousal.
C. Surviving on nuts and roots
Demographic Transition
Population aging is a by-product of the process known as "<em>Demographic Transitioning</em>." This process is determined mostly by fertility and mortality rate. For example: a population that has a high fertility rate has a low amount of older people, and vise versa.