Roadrunner and RFI

I've posted several photos this summer from the roadrunners who nested in the local cemetery this summer, producing 2 clutches. The second group fledged 3 weeks ago, and then all 3 young and both adults abruptly disappeared. For some reason the adults decided to raise the juveniles outside the cemetery. I finally saw this bird after a 3 week absence. At first I thought it was one of the juveniles because it seemed small. However, looking at the photos, there is a complete eye ring. I saw what I assume is the same bird plus a second similar sized bird tonight, so I'm thinking that they are the adults, and the juveniles have moved on. I cannot seem to find any definitive info on how long it takes a juvenile to develop the full eye ring. Does this bird appear to be an adult or juvenile (3 weeks fledged)? Is there a source that describes in detail the development of juvenile roadrunners? Thanks in advance.

Here is a close up of the head.

If you are a member of BNA (Birds of North America) you can access pretty much everything known about an North American breeding bird species. At $42 a year, it's a bargain. There's some samples you can try to see what you think.

I'd judge this to be hatch year bird. It's pretty light, with a lot of cinnamon coloring. There's still some juvenal plumage on the bird's butt (although in poor feeding conditions those can apparently hang around for 2-3 years). The birds look sleek and healthy; it doesn't appear stressed so as to interfere with or delay molt. I see some inverted "U" shapes in the primary coverts. It's hard to tell, but the tail feathers appear to be wedge-shaped instead of oblong. All that points to a hatch year bird.

The eye ring or extent of the eye ring isn't mentioned as an aging characteristic. Sorry.

Thanks for the input, Jim. These birds eat well, so no poor diet to delay molt. I saw a third roadrunner Friday afternoon, and it was clearly a juvenile. It was noticeably smaller than the other two I had seen in the previous days. Sure wish all 5 birds would make an appearance at once, to compare the adults to the juveniles :).