The ratio varies between age groups. At birth, for instance, boys outnumber girls by 1.07:1, but at 65 years and up the male population falls to 0.9 to every 1 female.
Some countries have much starker contrasts between male and female populations, often due to social issues. In India, for example, as in many other countries, male children are preferred and female births often aborted. As a result, it is predicted that men will greatly outnumber women in India by 2031.Learn more about Population & Demography