The domain name system is not hard to understand but yet those who are not technically savvy tend to rely on an agency or a web firm to manage it for them. There are pros and cons to this but first we need to understand how all this works so you have a solid understanding and know the risks that you are taking by not managing your own domain name.

When moving Web operations to a hosting service it is not enough to say, “Let’s move.” You have to consider what sort of new living arrangements will be made. There are three possible arrangements: managed, dedicated, and co-located hosting services. Here, we will consider the advantages of dedicated hosting services. In a dedicated hosting arrangement, the hosting service provider supplies a physical server dedicated exclusively to your applications. Basically, you are renting an unfurnished house on the host’s property. You don’t have any neighbors on the other side of walls, floor, or ceiling to bother or be bothered by. You can decorate the place however you wish, within reason. The landlord is responsible for maintenance of a few basic things like plumbing connections, but generally you have to keep your place clean and tidy yourself.

Usability in web design or usability case study are a few that you can use in Google/Bing to research some of what you are looking for. There are quite a few good books on usability that I recommend to anyone asking about this. Don't Make Me Think and Rocket Surgery Made Simple by Steve Krug are two very good books on this subject.

You are wise and also very lucky to find the amount of people that you did to run a usability test on. Any web design is going to depend on a variety of factors and as you pointed out age is one of them. There are a multitude of guidelines that you need to factor in with each and every design. So many factors that I don’t have the time here to go into much detail.

Here are a few links that I touched on while doing a fast search for you that will help. Although not the whole picture it might give you a one up to know what to search for. If you are interested in this subject as all web designers should be I strongly recommend the two books I pointed out.

http://www.usability.gov/guidelines/

http://www.1stwebdesigner.com/design/case-study-call-to-action-in-web-design-usability/