:You are correct, of course. I apologise since, as a biologist, I was focussed far too much on the technical meaning of the terms in use. You see, when biologists speak of "maturity" we invariably mean "sexual maturity" which is equated with maturation of the gonads. To a biologist, a white-tail is mature (has mature gonads) at 1.5 yr of age. I can see, by your contribution, that there are other, vernacular, meanings for the term "mature" which would be more familiar to the average reader. I respect those facts and that you have stated them correctly. I shall edit the article accordingly. If you have further insights, please proffer them, here. —