Older women - why do they look at younger men?

Why do mature ladies in their 40's - late 50's look at younger men in their 20's and keep glancing at them of they see a nice looking one at a pub (when they're evidently not drunk.)

It's ladies who aren't obviously cougars/slappers/tarts at first, just sort of woman "true to their age" if you know what I mean.

It's just this happens to me a lot where older women look and glance at me a lot.

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