evidence: Countries over 50 percent (shown in orange) have a higher female population, while those below 50 percent (shown in purple) have a higher male population. [...] But as we move through adulthood, the sex ratio declines. In 2021, among 50-year-olds the ratio was close to 100. Among 70-year-olds, there were only 86 men per 100 women. In the very oldest age bracket, people aged 100 and older, there were only 24 men per 100 women. [...] For some countries, you can see that the decline in the sex ratio with age is even more extreme — in Russia, for example, by age 50 there were only 91 males per 100 females in 2021. By 70 years old, there were around half as many men as women.