How can you compare teenagers from the past generation from our current generation?

iam writing a comparison and contrast essay and iam gonna try to compare how teenagers from the past generations are different from ours. any ideas on what points i can touch?How can you compare teenagers from the past generation from our current generation?
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Japanese teenagers in Fukushima, JapanAdolescence (lat adolescere, (to) grow) is a transitional stage of physical and mental human development that occurs between childhood and adulthood. This transition involves biological (i.e. pubertal), social, and psychological changes, though the biological or physiological ones are the easiest to measure objectively. Historically, puberty has been heavily associated with teenagers and the onset of adolescent development.[1][2] In recent years, however, the start of puberty has had somewhat of an increase in preadolescence (particularly females), as well as an extension beyond the teenage years (typically males). This has made adolescence less simple to discern.[3][4][5]





The end of adolescence and the beginning of adulthood varies by country as well as by function, as even within a single country there will be different ages at which an individual is considered mature enough to be entrusted with particular tasks, such as driving a vehicle, having sexual relations, serving in the armed forces, voting, or marrying. Also, adolescence is usually accompanied by an increased independence allowed by the parents or legal guardians and less supervision, contrary to the preadolescence stage.


[edit] Puberty





Teenage boy. Though the facial structure resembles more an adult's than a child's, he has not yet achieved beard growth.Main article: Puberty


Puberty is a period of several years in which rapid physical growth and psychological changes occur, culminating in sexual maturity. The average onset of puberty is at 10 for girls and age 12 for boys.[6] Every person's individual timetable for puberty is influenced primarily by heredity, although environmental factors, such as diet and exercise, also exert some influence.[6]





Puberty begins with a surge in hormone production, which in turn, causes a number of physical changes.[6] It is also the stage of the lifespan in which a child develops secondary sex characteristics (for example a deeper voice or larger adam's apple in boys, and development of breasts and more curved and prominent hips in girls) as his or her hormonal balance shifts strongly towards an adult state. This is triggered by the pituitary gland, which secretes a surge of hormones, such as testosterone (boys) or estrogen and progesterone (girls) into the blood stream and begins the rapid maturation of the gonads: the girl's ovaries and the boy's testicles. Some boys may develop gynecomastia due to an imbalance of sex hormones, tissue responsiveness or obesity.[7][8] Put simply, puberty is the time when a child's body starts changing into an adult's body.[6]





Facial hair in males normally appears in a specific order during puberty: The first facial hair to appear tends to grow at the corners of the upper lip, typically between 14 to 16 years of age.[9][10] It then spreads to form a moustache over the entire upper lip. This is followed by the appearance of hair on the upper part of the cheeks, and the area under the lower lip.[9] The hair eventually spreads to the sides and lower border of the chin, and the rest of the lower face to form a full beard.[9] As with most human biological processes, this specific order may vary among some individuals. Facial hair is often present in late adolescence, around ages 17 and 18, but may not appear until significantly later.[10][11] Some men do not develop full facial hair for 10 years after puberty.[10] Facial hair will continue to get coarser, darker and thicker for another 2-4 years after puberty.[10]





The major landmark of puberty for males is the first ejaculation, which occurs, on average, at age 13.[12] For females, it is menarche, the onset of menstruation, which occurs, on average, between ages 12 and 13.[13] The age of menarche is influenced by heredity, but a girl's diet and lifestyle contribute as well.[13] Regardless of genes, a girl must have certain proportion of body fat to attain menarche.[13] Consequently, girls who eat high-fat diet and who are not physically active begin menstruating earlier, on average, than girls whose diet contains less fat and whose activities involve fat reducing exercise (e.g ballet and gymnastics).[13] Girls who experience malnutrition or in societies in which children are expected to perform physical labor also begin menstruating at later ages.[13]





The timing of puberty can have important psychological and social consequences. Early maturing boys are usually taller and stronger than their friends.[14] They have the advantage in capturing the attention of girls and in becoming hand-picked for sports. Pubescent boys often tend to have a good body image, are more confident, secure, and more independent.[15] Late maturing boys can be less confident becauseHow can you compare teenagers from the past generation from our current generation?
My advice is interview different people from different generations and get your information from them.