How many overweight people in their forties and fifties feel that losing weight is unrealistic?

I am currently involved in an ethical entrepreneur class and I have been considering doing my business feasibility plan on working with overweight older adults for them to obtain healthier lifestyles that are easy for them to fit into their everyday life. What I am wondering is how many older people think that it would be worthless to participate in fitness programs like this one or have been so discouraged in the past by lack of results that their not willing to try another program?

Do you have any ideas for ways around this or things that have worked for you that is not crash dieting?

Actually, there is nothing unrealistic about using exercise and nutrition to become fit at any age.

I personally know many people who have transformed their physiques in their 40′s, 50′s, and 60′s.

Here is more info about transforming a physique.