Research from past decades suggested that people got happier as they got older. Now, that trend appears to have reversed, with people over 30 saying they are less happy than people in their teens and 20s, New York Magazine reports. The findings come from a study published 5 November in Social Psychological and Personality Science that included 1.27 million teenagers and more than 50,000 adults. Although the study didn’t explain why adults are growing less satisfied, one possibility put forth by the researchers is that of unrealistic expectations: Modern youth are more optimistic about their futures than ever before. But when their hopes are dashed later in life, many may suffer crushing disappointment.