Pink, sorry. XD He looks orange in those pics.
Yes, I *think* the dragon pattern shows up more with age- but rather subtly. And unless he's very small, he doesn't look that young to me- just skinny and malnourished. If he didn't have any fin damage, his fins would be lovely and big.
Unless he has ANY thick, shimmery, white scaling anywhere else on his body, I would say he isn't quite a dragon. If he has the scaling on his gills he has the gene, but I doubt the scaling will progress any more on his body.