My mother married at 18. Not something I'd encourage my dds to do (nor would she!) but tbf, she & other aged parent are 50+ years into a very successful marriage.
She'd been the youngest dd of a widowed, older mother, & was basically expected to keep house for dgm, who was pretty aghast when df rocked up.
She'd had years of sexual harassment from older BILs by this point - something she's only talked with me about very recently now my uncles are dead, but which df was aware of - so that's explained why big family get togethers were always awkward 
.
I'm pretty sure my then teenage mother, in the 60s, knew exactly what a woman is.
She'd got herself rather a good job, & was encouraged to leave when she married. She dug her toes in, but was forced out a couple of years later when I arrived.
I'm quite sure my mother spent the 70s & 80s, raising me, knowing exactly what a woman is, before returning to work in a female dominated profession.
& she's sure as hell in no doubt now, in her 70s & GC as they come.
Mind you, she's come across a few old skool transsexuals, in her professional capacity, & has always been hugely supportive of them.
But believing them to be women, in the same way that she's a woman? Nope.
Nor would any of her contemporaries sign up to 'TWAW!' - on account of it being, as her yoga group agreed recently, 'total sodding bollocks, dear, isn't it?'