RT Article T1 More happiness for young people and less for mature adults: Time period differences in subjective well-being in the United States, 1972-2014 JF Social psychological and personality science VO 7 IS 2 SP 131 OP 141 A1 Twenge, Jean M. 1971- A1 Lyubomirsky, Sonja A1 Sherman, Ryne A. A2 Lyubomirsky, Sonja A2 Sherman, Ryne A. LA English YR 2016 UL https://krimdok.uni-tuebingen.de/Record/1912626063 DO 10.1177/1948550615602933