No need for sorrys, I think they showed him like this maybe once in the TV series (and it was a statue of him made out of ice). But in the comic he's like this in a story, were robots take over the world.
(( Hm, I see. I have not been following the show lately and reading any of the comics. It appears interesting; it makes me wonder if in future episodes, they will have a peak at older Finn once more. Lately I've seen that Marceline and Ice King have been getting attention. ))