The average fire ant queen lives 6 to 8 years. This pretty typical for ant queens. Carpenter ant queens live from 10 to 15 years. The little black ants? Lasius niger and neoniger (these are small black ants found in the US, UK, Europe and more) have queens that live for two to three decades.
There may be a thirty year old insect in your yard and she is very busy!
(Six years ago this was the "ant fact" that made be obsessed with ants.)