A number of you wrote in asking for online resources for style tips for women in their 40's and 50's. I have read a number of sites now and I think these two have the best realistic handle on this demographic:
More Magazine has both comprehensive beauty and fashion areas. Find it here.
Secondly, Real Simple does have a solid grip on real life women and the styles they are willing to carry, versus those prescribed by couture magazine stylists. Find the style section on line here.
Both sites allow you to receive regular emails or use iPhone apps.
Finally, in the way of advice, this relatively generic about.com tutorial is the most comprehensive I have found regarding achieving your best look or looking ridiculous - there are pit falls in fashion at every age...
Finally, and I want to stress this: tailor your clothing.
I hope I have helped.