Part of the feeling of invisibility is that in a youth-oriented culture, women of a certain age (and I am well past the sell-by date at age 58) become invisible to marketers, retailers, advertisers,etc. Just like A&F and LuluLemon do not want people of size in their stores or wearing their product because they fear us fatties will turn off the "typicals," some retailers do not wish to be identified with older women, fearing it will turn younger women off. I find this to be an offensive attitude, but it's a fact of marketing in that you choose a brand identity and then you live with it.
It seems like there are two age ranges for women: 15-28 and then really older women (like the "I've fallen and I can't get up!" age range). The women in the middle, say ages 35-55 are kind of lost, or become "generic mom." There are a few retailers who cater to the invisible woman....Chico's and Coldwater Creek come to mind (I'm not a fan of either) and maybe Talbots. I saw an ad for Cadillac over the weekend where the woman driver of the car, who is the same model as in the Chico's ads, is turning heads. I am fascinated by that campaign because clearly Cadillac is aiming for a specific target woman with that vehicle (a spendy CUV.)
The styles sometimes don't seem to be skewed toward what 35-55 want as well....skirts are very short, sleeves are non-existent. What does get pitched to older women: Spanx.
So if you don't see women of an older age modeling the garments, or in ads, you feel as if you are invisible, or at least, not welcome.
But invisibility is also an attitude. If you want to be invisible, you can be. If not, then don't accept that role.
I'm sure I've offended a whole lot of people. Sorry.