Happy slapped by toerags on a moped

Just hazarding a guess but I would imagine that there is a good chance they were below the age of criminal responsibility

Below the age of criminal responsibility . . . bollox!

If they are old enough to steal & ride a moped whilst assaulting people on it, then they are old enough to be tried and convicted in a court of law.

But not if it happened on a train?

At no point has the age of the assailants been made public knowlege.

you're entirely correct, their age is not known, so dammit and donut getting hot under the collar about them not having criminal responsibility is redundant. they would have to be under 10 years of age to have no criminal responsibility. it wasn't a dig at the OP, unless they are complaining about getting hit by someone 9 years old or younger.