How do you capture a niche market ?

I have read many 'How to make $ on the internet', 'How to increase traffic on the blog?' and many 'How to...'. I thought I also follow the trend to write a 'How to ...' topic.

This is the topic I want to talk about tonight. How do you capture a niche market ?

However, before we even answer this questions, we probably want to ask ourselves : What kind of niche market do we want to capture ? Only after we answer this question , can we have our bearing on finding the How's resources.

How many of you who are reading my blog know that "The elderly are the fastest growing segment of the population and thus have contributed to the "greying" (aging) of the American population." ? Quote from Encyclopedia of the Nations :: Americas

I work with elderly people a lot and a lot of my friends are in the 50's and 60's, the golden girls and golden boys :). Many of them know very little about internet but they are very interested in internet as well.

If you have read one of my post earlier about this , you know that the younger the age, the more tech savvy they are. Do you think there is an inverse equation here : + age = -tech; -age = +tech

Might be I like to challenge my readers to do a simple Math equation for me.
The 2 defined variables :
1. Age:
Age in term of numeric from 1 to 10, 1 being baby to 10 years old, 2 being 11 to 20 years old and so forth.

2. Tech :
The number of bloggers in term of age in America.

Say you find 300,000 bloggers in their 30's . Then it 3Age=300,000tech and so forth and forth.

Do you think you can quickly come out with a a simple graphic presentation of age VS tech ?

Do you see this is a very lucrative under reach niche market ?

Well, this is a topic where I like to challenge my readers to give me your inputs and might be we all can partnered in this niche market ?