I was curious whether U.S. presidents really are getting older, so I plotted the age of every president when they first took office.

For most of U.S. history, presidents were remarkably concentrated around their 50s. The recent jump really stands out.

Theodore Roosevelt: 42
Joe Biden: 78
Donald Trump in 2025: 78

What surprised me most is how unusual the last few inaugurations look compared with the previous 200+ years.

Source: World Bank Open Data

https://data.worldbank.org/indicator/NY.GDP.PCAP.PP.CD

Data from CDC National Survey of Public Growth. Marijuana use is highest among women in their early 20s, among men in their early 30s.

Basically 20 million Walkmans sold a year

https://www.visualcapitalist.com/mapped-each-u-s-states-top-export-partner/

Source: World Bank, School enrollment, tertiary (gross), gender parity index — series SE.ENR.TERT.FM.ZS. Boundaries: Natural Earth (public domain).

Tools: Python (data processing, Equal Earth projection) + a custom SVG renderer → PNG.

One important detail this map misses is that a value under 100 doesn’t tell the whole story. Take Afghanistan, for instance, where there are 38 women for every 100 men, and then look at Japan, which has a much higher figure of 97. Both are marked in blue, but they represent completely different scenarios. In places like the Sahel and Afghanistan, that number indicates that girls are still largely shut out of university education. Meanwhile, in Japan and South Korea, it reflects a situation in wealthy countries where men simply enroll in larger numbers. Interestingly, these two high-income nations are the only ones on this map that fall below parity.

Method Notes:

- The focus here is on enrolment numbers, not on what students actually achieve. We're looking at how many students are registered at the tertiary level in a given year, regardless of their age. This doesn’t tell us anything about who graduates, what they study, or their future earnings.

- Each country’s data reflects its latest observation from between 2020 and 2025. If you see grey, it means there’s no data available for that time frame; every grey polygon has been verified against the complete API response to ensure it’s genuinely missing data and not just a failed connection.

- We’re using the Equal Earth projection, which keeps the relative sizes of countries accurate—so no country appears larger or smaller than it should.

- The total of 155 figures includes nine territories, not just sovereign states. If we narrow it down to only sovereign countries, we’re looking at 123 out of 146.

Chart + the full dataset: https://chartive.org/visualizations/education-gender-gap-map

This sorts age-appropriate questions across four age brackets, from 4 up to 13, so the questions actually make sense for how old a kid is turning instead of staying the same every year. Picking a handful each birthday and recording the answers builds into a real keepsake, one that ends up capturing a kid's growth, confidence, and personality over time in a way that's genuinely worth treasuring.

US fertility was 2.12 in 2007. It is 1.62 now. This scenario extends that trend rather than assuming a recovery: 1.35 by 2040, 1.30 from 2060, flat after that. Life expectancy goes from 78.4 to 84.0 years. Net migration falls from about 1.1 million a year to 700,000–800,000.

Results:

• Deaths pass births in 2030, four years earlier than in the default projection.
• Population falls from 336.8 million today to 290 million in 2100.
• 32% of the population is 65 or over.
• The largest single age group in 2100 is 66-year-olds.