Amtrak

http://www.amtrak.com/servlet/ContentServer?pagename=Amtrak/HomePage

Amtrak is a high-speed train.

The seniors use Amtrak because of its effective cost and convenience even though using Amtrak is more expensive than using bus or own car. 
Also, older people are hard to drive for a long time. Thus, for a long trip, older people prefer to take Amtrak train. In addition, time is worth for business man. As one of older people, business man prefer to take Amtrak to reduce time.

On the other hand, young people prefer to cheaper transportation and the freedom to go where you want.

Reference site http://lanceburri.blogspot.com/2004/07/less-greyhound-more-amtrak.html