Trechos de dois artigos da WP:
[Puberty] Historical shiftThe age at which puberty occurs has dropped significantly since the 1840s.[34][35][36] Researchers refer to this drop as the 'secular trend'. From 1840 through 1950, in each decade there was a drop of four months in the average age of menarche among Western European female samples. In Norway, girls born in 1840 had their menarche at average 17 years. In France in 1840 the average was 15.3 years. In England the 1840 average was 16.5 years for girls. In Japan the decline happened later and was then more rapid: from 1945 to 1975 in Japan there was a drop of 11 months per decade.
http://en.wikipedia.org/wiki/Puberty#Timing_of_onset
[Sir James Matthew Barrie, autor de Peter Pan]When he was 6 years old, his next-older brother David Barrie , his mother's favourite, died two days before his 14th birthday in an ice-skating accident. This left his mother devastated, and Barrie tried to fill David's place in his mother's attentions, even wearing his clothes. One time Barrie entered her room, and heard her say "Is that you?" "I thought it was the dead boy she was speaking to," wrote Barrie in his biographical account of his mother, Margaret Ogilvy (1896), "and I said in a little lonely voice, 'No, it's no' him, it's just me.'" Barrie's mother found comfort in the fact that her dead son would remain a boy forever, never to grow up and leave her.[1] It has been speculated that this trauma induced psychogenic dwarfism, and was responsible for his short stature and apparently asexual adulthood.[2]
http://en.wikipedia.org/wiki/J._M._Barrie