Several generations in one house works best if it's a very large house.

This generation will work with new products that have to go through a great deal of testing before they're approved, he said.

"Sometimes it takes generations for elements to work their way into production vehicles," he said.

Now, a fifth generation is working for the company.

Often several generations of the same family have worked for the company.

A generation of working men over the age of 50 will probably never work again.

Younger generations are working in a wider variety of jobs than the previous generation.

Longer life spans mean that more generations are living and working simultaneously.

Three generations work long hours in these stores so that the 10-year-old of the family can do something better.

The most recent generation of photographers work with new and digital technologies.