A YouTube channel called World Data has uploaded a video comparing the history of flags of different countries.
It is interesting to see how long each country's flag has been in existence.
Mauritania: 2017
Myanmar: 2010
Lesotho: 2006
South Sudan: 2005
Montenegro: 2004
Comoros: 2002
Rwanda: 2001
Bosnia and Herzegovina: 1998
Afghanistan: 1997
Seychelles: 1996
Ethiopia: 1996
South Africa: 1994
Eritrea: 1993
Turkmenistan: 1992
Kyrgyzstan: 1992
Kazakhstan: 1992
Tajikistan: 1992
Uzbekistan: 1991
Moldova: 1990
Palestine: 1988
Iran: 1980
Angola: 1975
United Arab Emirates: 1971
Oman: 1970
Bardados: 1966
Canada: 1965
Iraq: 1963
Jamaica: 1962
Cyprus: 1960
Ivory Coast: 1959
Singapore: 1959
Nigeria: 1959
Syria: 1958
Cameroon: 1957
Egypt: 1953
Belarus: 1951
Qatar: 1949
North Korea: 1948
Pakistan: 1947
Malta: 1943
Mongolia: 1940
Algeria: 1934
Saudi Arabia: 1932
India: 1923
Republic of China: 1921
Czech Republic: 1920
Estonia: 1918
Iceland: 1918
Armenia: 1918
Azerbaijan: 1918
Thailand: 1917
Morocco: 1915
Portugal: 1910
Australia: 1901
Philippines: 1898
Israel: 1891
Brazil: 1889
South Korea: 1882
Monaco: 1881
Bulgaria: 1879
New Zealand: 1869
Cuba: 1868
Romania: 1867
Andorra: 1866
Finland: 1861
Bolivia: 1851
Costa Rica: 1848
Ireland: 1848
Croatia: 1848
Slovenia: 1848
Ukraine: 1848
Slovakia: 1848
Germany: 1848
Luxembourg: 1845
Paraguay: 1842
Serbia: 1835
Belgium: 1831
Poland: 1831
Uruguay: 1828
Tunisia: 1827
Honduras: 1823
Peru: 1822
El Salvador: 1822
Greece: 1822
Norway: 1821
Mexico: 1821
Chile: 1817
Argentina: 1812
Ecuador: 1810
Colombia: 1810
Venezuela: 1810
Haiti: 1806
United Kingdom: 1801
San Marino: 1797
Italy: 1796
France: 1794
Turkey: 1793
Spain: 1785
United States: 1777
Liechtenstein: 1764
Nepal: 1743
Russia: 1696
Tonga: 1674
Sweden: 1562
Switzerland: 1470
Albania: 1443
Netherlands: 1409
Georgia: 1350
Latvia: 1279
Austria: 1230
Denmark: 1219
Japan: 701