i dont know how old they were exactly but i'd had them for about 4-5 months. they were in the same tank at the lfs and i bought them together. they seemed to be fine since i got them, like searching around their new tank together and sharing the same hiding place.
but then i woke up one morning and the smallest seemed to be gasping for air and it's skin was all patchy and it's eyes were a little dull... the fish just looked like it was ready to die so i cornered off a section of the tank so it didn't have to fight the water flow so it could die in peace.
when it died, this being the first case of a dying pictus catfish, i tried fishing it out with a net... ruining the net! the fish got stuck in there and i had to cut it out. theres a tip! nets and pictus cats don't mix lol
anyways... i had 2 left. a few days after the first death, i noticed there was abit of agro between them. i figured they were the same size, not much difference anyway, so i left them to it. this was in the morning so i had to go to college too.
i got back from college, checked the fish and found the smaller one with no whiskers. it was floating around, struggling to swim and being the nice person i am, i again cornered off a section of the tank to give it some peace while it died.
now i have one left and it seems to be doing well. no signs of any poisoning or other reasons for these fish to die.