Kosovo is the only country in Europe in which the 10-19 age group is dominant in the population, according to "Eurostat" data, compiled by Landgeist.
A recently published map shows the distribution of age groups in all regions of Europe. Of course, it is a small demographic detail and does not show the full picture of the data, but it signals the future of a country.
https://www.koha.net/arberi/374494/kosovaret-te-paret-ne-evrope-per-prona-te-shtepive/
In most of Europe, the 40- and 50-year-old age groups are the most dominant. The difference is Kosovo, which is dominated by teenagers. Albania, Iceland and part of Turkey are dominated by the 20-29 age group. In the Balkans, in Croatia and Serbia, the dominant age group is that of 60 years old.
There are countries in which there are marked differences even within the regions. On the map, big color changes are observed especially in Germany and Great Britain.
As "Landgeist" wrote, the data for Kosovo are from 2020.

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Dependence on the elderly: Kosovo among the countries with the lowest percentage
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Kosovars, the first in Europe for house ownership
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Kosovo among the countries with the highest use of the Internet
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The representative of Kosovo has the youngest age of the team in Europe
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69 percent of young Kosovar people live with their parents