My oldest fish & still living is a cichlid (Tropheos likoma to be precise coz there are lots of cichlid types). He's 4 yrs old & living in a planted 10 gal aquarium.. He was a juvenile when I got him from lfs. It's color is metallic blue with dark zebra stripes, during his growing-up phase, the blue color is slowly turning to yellow. Right now he's grown to 8 inches, turned it's color to a full yellow with faint mark of stripes.. Because of him, I learned a lot about aquarium keeping & keeping the fishes health..
BTW, his name is Architect coz he has his own way of designing aquarium gravel & small white stones.. Aquarium has an undergravel filter & 30-50% weekly water changes..