Agree with Nutcracker on the ringers thing. As a ringer myself I feel unprejudiced to say I'm sick of hearing of made-up inferences of age, sex and geographic origin just because the bird is in the hand. The 'Scandi Blackbirds have black bills' myth is widely believed (and dropped into conversation by birders and ringers forgetting there's no peer-reviewed source on the matter) but was busted to my satisfaction last autumn when a British ringer posted a photo of a re-trapped Blackbird with a black bill. It was originally ringed 'just up the road' as a juvenile. Before that, I believed it too, and am ashamed I didn't check my sources.
As for whether only first winter males have black bills, I'm more inclined to believe that, but individual differences in rate of colour change are likely to occur as with many developments.
Finally, yes those birds pictured are adult and juv Starling for me.