Pleasure, joy, contentment, satisfaction, fulfilment, peace of mind, the relative absence of pain and suffering—these are perhaps the correlates of happiness. But how should one define happiness if one must? Every human being that has lived has attempted to define it in his or her own way. If any of them were successful is something you and I cannot be the judge of, because happiness has meant different things to different people. Its definitions change with time. It changes as we age.