I'm a personal trainer with over 20 years of experience in the health and fitness industry. All my career I have been an advocate of strength training, especially for women. Below is a link to one of the best articles I've recently read by Prevention Magazine about the benefits of strength training for women over the age of 50.
Best Strength Training Exercises For Women Over 50 | Prevention
Please checkout my favorite strength training routines for those of you over 50 at: Forever Fit and Firm.