This was my first day back to the gym after taking a week off due to a nasty cold, and the place was mostly empty. I was surprised. Maybe the rain chased them off.
I haven't noticed them because they probably go between 4-7pm....times I wouldn't even attempt to work out in January. The 5-5:30 am crowds don't usually change much through the year. It's just a part of a schedule.
At mine, they're mostly on the cardio equipment. The only problem that this causes is now I have to park the car further away from the gym to get a good warmup.
I have only seen a couple of blue-haired beauties at the gym.
The large retiree population is a gold mine around here for women, with lonely, newly-single women popping up weekly with fat insurance checks from their departed hubbies.