Charlie Hardesty is a personal trainer in Quincy, Mass., with a lot of female clients, and he's not too impressed with the older ones.

"Most of them have never exercised in their lives," said Hardesty, referring to women 50 and up. "As far as they're concerned, going to the mailbox is exercise."

For today's older women, "the level of (exercise) education and awareness hasn't been there their entire lives as it has been for women 40 and younger," said Michael E. Rogers, research director of the Center for Physical Activity and Aging at Wichita State University in Kansas. 

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