It’s a fair assumption, since the media has decided to use the euphemism “teen” to describe black perpetrators of an age range beyond teen age.
I’d assume that as well, since inner cities in the northeast are often reduced to urban blacks and trafficked Third World imports. It is amazing how quickly white flight leaves little else in an area...
Any group of Negro malefactors that includes at least one who is below 20 seems to get the descriptor “teens” though a single “teen” is probably actually between 12 and 20.