life than ever before.In 1900,Americans' average lifespan was only 47 years,but today it is 75 years!When does old age begin then?Sixty-five may be out-of-date as the (4) D line between middle age and old age.After all,many older people don't begin to experience ...
A.Their average lifespan was less than 50 years.B.It was very common for them to have 12 children.C.They retired from work much earlier than today.D.They were quite optimistic about their future.【2】A.Get ready for ecological changes.B.Adapt to the new environment.C.Learn to use new...
The increase in energy use at various points in our lifespan (寿命)seems to be the result of life style and how our needs change as we age. Why does demand grow so much in our 30s “We need more of everything. More space, a bigger TV two fridges," says Estiri. The study found...