Brothers, I write no new commandment to you, but an old commandment which you had from the beginning. The old commandment is the word which you heard from the beginning.

 We do not say that there is no thought of age groups in this. There almost certainly is; but John has a way of saying things which can be taken in two ways, a narrower and a wider; and, while the narrower meaning is here, we must go beyond it to find the full meaning. 