The onset of puberty usually occurs from ages 10 - 15. Some of the first noticeable sings in males are the voice deepening and facial, armpit and pubic hair growth. For females some of the most noticeable signs include, changes in body shape.
See link:
http://www.ehow.com/how_2102746_tell-youve-started-puberty.html
(For boys and girls)
Normally, the first indicator of puberty for males is the growth of penis hair around your penis and scrotum, on your upper lip, and/or under your arms and on your legs. You may also experience spontaneous erections and begin feeling sexual feelings toward the opposite gender (or, if you prefer, the same gender).
The testes begin to grow larger, hang lower and the skin there darkens in color and pubic hair starts to grow as the first signs of puberty in a boy.
LH is the first hormone to demonstrate an increased secretion
Onset of puberty means that some changes are taking place in your body. Like there will be increase in the size of the testis. There will be growth of hair on the pubic regions.
After the onset of puberty, males produce semen.
The onset of puberty is triggered by the release of GnRH from the hypothalamus.
Hormones ! A person's hormones control the onset of puberty.
Biological Age
Children that are younger than the onset of Puberty
There are no proven links between diet and puberty onset.
menarche
puberty
The pituitary gland.
Menarche
Their are no disadvantages or risk in starting puberty early.
No, weight doesnt affect puberty. But proper diet and exercise helps a lot in puberty.