In the United States, there were 52 million adults 65 and over as of 2018. That number is expected to nearly double by the year 2060, with aging adults comprising 23 percent of the total population at 95 million. Life expectancy among Americans has also increased, if slightly, from an average of 78.7 years in 2018 to 78.8 years in 2019. For males in the U.S., life expectancy ticked up from 76.2 in 2018 to 76.3 in 2019. Females in the U.S. saw a 0.2 year increase, from 81.2 years in 2018 to 81.4 in 2019. How does the rest of the world compare? A recent study from U.K. research and information site Our Life Plan shows where retirement ages and life expectancies are anticipated to rise and fall across 36 countries with membership in the Organization for Economic Co-operation and Development (OECD). According to the site's research, life expectancy will be the longest in Korea over the next 20 years, with women living for over three years longer than men by the year 2045. Estonia will see the largest difference between men and women's life expectancies, the study says, with females predicted to live nearly eight years longer than males in 2025. decreasing to nearly four years longer than men in 2045.             Our Life Plan projects that life expectancy in Mexico will increase only 1.71 years between 2025 and 2050. The research puts the United States in third place, with life expectancy increasing a little over three years in the same time period.             See our slideshow above for the countries with the oldest and youngest projected ages of retirement, and click here for the full study.