Hallmarks of the teen years, ages 1319:

1
What is Adolescence?

• Hallmarks of the teen years, ages 13-19
• Growth spurt
• Rising hormonal levels (estrogen, progesterone,
  testosterone, androgen)
• Menstruation and ejaculation begin
• Girls develop breasts boys develop hair on face,
  chest, voice deepens.
• Pubic hair appears
• Reproduction becomes possible
• Interest in dating and sex increase
• Abstract and scientific thinking appear
• Teens question Who am I? What will I do with
  my life?
• Initiation rites include confirmation, bar
  mitzvah, and graduation.

2
Penis adult size mature pubic hair
Underarm, facial hair appearing voice deepening
Pubic hair appearing penis enlarging
Testes enlarging
First ejaculation
Age
8
9
10
11
12
13
14
15
16
17
18
4
Growth spurt peak
10
GIRLS
BOYS
3
8
6
2
Height increase in centimeters
Height increase in inches
4
1
2
Age
Mature pubic hair
Pubic hair appearing
Breast bud
First menstruation
Underarm hair appearing
Mature breast
3
Adolescents' Reactions to the Onset of Puberty
Time of Onset Early Late
Reaction Initial Later Initial Later
Male Positive Mixed Negative Positive
Female Negative Positive Positive Mixed
4
12 - 17 Years
18 - 25 Years
26 - 34 Years
35 Years and older
All Americans 12 Years and over
Percent of Teenagers Using Illegal Drugs
1978
1980
1982
1984
1986
1988
1990
1992
1994
1996
5
Summary of Adolescent Physical Development

• Growth spurt proceeds in distal-to-proximal
  direction
• Hormones increase and puberty occurs
• Girls mature earlier, on average, than boys
• High risk for injury and death