can we really accomodate everyone?

When designing for different generations there is much to consider. First, it depends what kind of design... in this case scenario, lets assume interactive/digital design. There are many different generations out there right now and the older generations have a very difficult time understanding and absorbing the new technologies and how to apply them. Also, as we age and become engulfed in our current positions, we forget to "update" ourselves and refresh our minds as to what new applications and technologies are out there the help us improve work flow etc. Now when designing, you want to appeal to as many people as possible and that demographic is always expanding so it is hard to customize everything... It is most definitely something that needs to be considered, but depending on the project. Sometimes you are going to need to customize for specific generations... other times it is going to be designed to meet the latest technology standards - to keep up with the constantly changing and evolving interactive technology.