In a recent survey, AARP asked Americans at what age they think they will be over the hill. Here are the answers by generation...
Age at which you will be over the hill
Gen Xers: 62
Boomers in their fifties think they will be over the hill at age 74. Those in their sixties say it will be at age 76. People in their seventies say not until age 80.
Source: AARP, AARP Research: A Conversation Starter about Age