You can tell how old he is by the wrinkles around his gill !

No he might have just been asleep or going through something.
I had a 4 spot damsel which is real black with 4 white spots one time that turned as white as he could, he hid and would not come out. I knew for sure he would die but this went on for 2 weeks then one day he came out of hiding and looked as good as new and never had anything like that again for along time.
Don