London: The onset of puberty has fallen by more than five years in girls – with experts blaming kids’ unhealthy lifestyles for it.Some girls are only six or seven years old when they have to cope with their first period, the Sun reported.A US study has found that boys are also hitting physical maturity two years earlier than they did in the past.Scientists found that the average age for the onset of puberty in girls was 16.6 years in 1860.But by 1920 it was 14.6, in 1950, 13.1, in 1980, 12.5 and in 2010 it had decreased to 10.5.
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