求翻译：大部分人在青少年和二十多岁觉得还算快乐，当他们开始为家庭奋斗时幸福感就开始下降，直到进入中年才开始回升。从45岁开始人们会变的快乐乐观起来。这种乐观心态可能会在七八十岁达到顶峰。是什么意思？

Most people in the youth and twenties feel pretty happy, when they began to struggle for the family when happiness began to decline until well into middle age began to rise. From the age of 45 happy people become optimistic again. This optimism may be in seven or eight-year-old peak.

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Most fairly happy in adolescent and more than 20 when they begin fight for family happiness began to decline when, pick up until entering middle age are beginning. From the age of 45 people will become happy optimism. Such an optimistic attitude may reached its peak in seventy or eighty years old.

Most people felt fairly happy in adolescents and more than 20 years old, when they began to fight for family happiness begins to drop, until entering middle age only began to recover. From the age of 45 people will become happy optimism. Such an optimistic attitude may reached its peak in seventy or