well,I don't think so.Many people can remain their passion and love of the world during the whole life time.I guess a man who lose his hope has no happiness.if an old people have seen through the life,he would not be pessimstic but love his life even more.I'm a teenager.Perhaps I haven't experienced so much,but I'll keep on being opmistic.
recommend:周国平《悲观与超脱》