Anytime is a good time to start Penis Enlargement.
Adolescence is what?
A time for growth and sexual (amongst other kinds of ) maturation. How would Penile Enlargement stop adolescence?
1) The best routine for newbies is...surprise! "The [words=http://www.mattersofsize.com/forum/penis-enlargement-newbie-forum/1597-dlds-first-routine-i-gained-2-inches-with-this-routine-full-tutorial.html]Newbie Routine[/words]." Yes, surprising, I know.
2) Although he can start Penis Enlargement at 16, membership begins at 18.
Just remind your brother not to get too caught up in the "youthful enthusiasm" that most 16 year olds do.
Something worth doing is not always worth overdoing!
Here's an edit after I did a bit of research. It seems I stand somewhat corrected, unless I misunderstood your original post:
Puberty is the process of physical changes by which adolescents reach sexual maturity, i.e. become capable of reproduction. Puberty refers to the bodily changes, while adolescence is the period of psychological and social transition between childhood and adulthood. (sources: Wikipedia and New Oxford American Dictionary).
In nonspecialized discussion and writing, the meanings tend to get blurred, and puberty can be used to refer to the period during which the changes happen, getting a meaning closer to adolescence. Adolescence still encompasses a typically larger period of time, however: puberty is over when the young individual's body has fully transformed, while it takes some more time for him or her to be recognized as an adult. Criteria for the latter are somewhat arbitrary, the typical example being “having reached the age of majority or being emancipated” (the age of majority depending on the country of residence). Some people even talk of 20-something adolescents to refer to people who have not yet reached an autonomous state of living, while being of full legal age.
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As a side note, adolescence has a related noun (adolescent) and adjective (also adolescent), while puberty has a related noun (pubescent) and three adjectives (pubescent, pubertal, and sometimes puberal).