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All of my 2008 hatch peachicks looked like 2 year olds in 2009 I traded some to Sid at Texas Peafowl and he thought they were 2 yr olds, colored out with small trains, so I would not judge the age just by the neck feathering.
For me the patch below the neck has been generally reliable. Not the neck, but the patch that starts out white on males and stays off-white or buff on females. On males less than year old, it's either mostly white or white peppered with dark feathers. Past one year, it starts to 'fill in' as the white gradually disappears. I never saw a male younger than one with this patch a solid dark color.
I know what you mean, some of my yearlings will grow out eyes and have a fair bit of color, look just like a typical 2 year old, these can start showing first eyes as young as 5-6 months old. Had one male that was showing eyes at just 3 months old, this one had a 2 foot long train feathers(not all colored or eyed) at 6 months old.
I've had people shocked at the appearance of those yearlings and also some of my 2 year olds having pretty well advanced tails and coloring too.