Not to be mean about it, but... my stoker is 55y.o. Standard cycling jerseys fit her just fine. It is not a given that a woman (or man) must necessarily get larger or in anyway have a different kind of shape than a younger woman. Performance bicycle clothing has always fit aggressively. That's just how it is. It makes it hard for men that have guts as well to find bike specific clothing. So.... don't. 98% of my (and my SO) riding is done in non-bike specific clothing. Not an issue. Seriously. FWIW.