It's hard to believe, but I'm coming up on two years. My three males are still going strong, they have disinctly different personalities, and have physical quirks that make them individually identifiable. Of my 8 anthias, one of my purple queens is the boldest. He doesn't care if I'm working in the tank - the rest will bolt for the rocks if someone makes a loud noise in the kitchen, but even with my arm in the tank up to the shoulder, one of my purple queens is out expecting me to feed him.
They've also gone from the most timid eaters, to the most aggressive. One has learned to pluck food that settles on the sand while the pumps are in feed mode up, while the others ignore anything that's not in the water column. They also show off to to my female dispars all the time.
Not sure how long they live, but they definitely seem to be in the prime of life.