Older, wiser--happier. What research reveals about who's happy and why.
D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000523:psychology*; D001294:Attitude to Health; D003071:Cognition; D014943:Global Health; D006240:Happiness; D015438:Health Behavior; D006801:Humans; D008875:Middle Aged; D011788:Quality of Life; D055815:Young Adult