No-one has yet commented on precocious puberty have they?
I don't know about refugees but I do know its about 10-20 times more common in children adopted from overseas and I would guess that the early life trauma (which is one of the theories of the high incidence) is very similar.
Why are people going on about receding hairlines? 
I've looked through the photos several times and the photos of a man with the receding hairline (same man in several photos) is the older brother of one of the boys.
Am I missing a photo somewhere?
One of the photos looks like an older male but all the others look like they're under 20 to me (and yes easily 17) - one of them looks exhausted and skinny and drawn but I suspect anyone might look like that.
Many of those photos are repeated ones of the same person - they only show 9 young men by my count. None appear to have a receding hairline and most to my eye look 16/17. And most of them are not "asian" by most peoples standards they are african or arabic.
A Home Office spokesman said 'essential checks' have been carried out on these young people, including security checks, verifying their ages and confirming their identities and eligibility to come to the UK.
Trying to get into the UK even for people with family here has been harder than pulling teeth - I would be amazed if the Home Office have suddenly had a brainstorm and decided to admit the 14 teenagers who look 20 years (by some of your peculiar standards!?) older without doing a fairly rigorous test. It's not like they aren't aware that the Daily Mail will be all over them like a rash.