Population data tools

Compare age composition between countries

The country comparison shows two pyramids on the same percentage scale for 2026. Start with Nigeria and Japan to compare a large child share with a large older share. Then read the population totals: the same percentage can represent very different numbers of people.

Changing either country updates the charts and indicators. Copy the comparison link to preserve your selected pair. Both charts use the UN medium projection, so their 2026 values are comparable scenarios from the same source revision.

Calculate the population in an age range

The age-group calculator adds the five-year bands you select and reports their combined count, share of the total population, and male–female split. For example, choose ages 65 through 100+ to measure the full older population, or 20 through 30–34 to include everyone aged 20–34.

Its five-year bands cannot isolate a range such as ages 6–17. Choosing 5–9 through 15–19 includes ages 5–19, so label that result accurately rather than treating it as an exact school-enrolment population. Actual school ages and participation require separate information.

Compare the same country over time

Open a country profile to switch among eight chart years. Its percentage scale stays fixed across those years. For exact counts outside 2026, use the CSV download or select the relevant year in the calculator. Read counts versus percentages before interpreting a falling share as a falling number of people.