The declines in narcissism took place over the span of decades. When you look back at how a close friend behaved 20 or 30 years earlier, you might notice the change, Dr. Orth said.
Still, the average decline was at most of moderate size, so you wouldn't expect that people's level of narcissism changes fundamentally.
The study also found that if people had higher levels of narcissism than others when they were children, then this was also usually true when they reached adulthood.
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