Images of European Herring Gull Larus argentatus argenteus ringed as White A / Green L as a nestling in July 1986 in the Netherlands. This means that this gull is now in its 30th calendar year and is 29 years old.
Note that after all this time, not only are both color rings still present but they are in excellent condition.
Incidentally, it was ringed 3 days previous to ‘my’ Herring Gull ZDGA, which at the time of writing hasn’t been reported yet in its 30th-calendar year.
All images were taken at IJmuiden beach, the Netherlands, 17 January 2015.
A short video showing White A / Green L feeding on ensis: