1.  So improving or updating an older model is quite easy.

2.  The new model has a smaller footprint than the older model.

3.  Emission standards for cars will be tightened, forcing older models off the road altogether.

4.  DTC said it had found using older models a reliable and cost effective way of keeping fares down.

5.  And digital phones, which are rapidly replacing older analog models, use even less.

6.  And new PC models need up to four times as much DRAM as older models.

7.  Apple said the decline was due in part to aggressive pricing on recently introduced computers, as well as price cuts designed to move older models.

8.  As more sophisticated models are introduced, older models become obsolete.

9.  Automakers, however, are coming out with retrofit kits to put the tether anchors in older models.

10.  Because the optical equipment amplifies light so much, bright lights or even daylight could damage the eye, especially in the older models.