I heard this last night and was disappointed. I think aging and feminism is an excellent topic to talk about but I can't see what good it did to bring up Miss World in the way that you did. I had assumed you'd been asked to speak about MW so thanks for clarifying that.
It seems to me that objectification of women has got significantly worse since the 70s and the difficulty so many of us have coming to terms with our ageing, sagging bodies is the flip side of this exact same coin: the more it matters what you look like, the more 'redundant' you are once your looks start to fade. When I was growing up I was quite sneery about the young women on MW. I never saw them as the enemy
but I did sort of pity their lack of ambition and apparent lack of intelligence. Not a good attitude to have towards other women, I'll admit, but it did save me from buying into all the beauty crap too heavily. Now, there's no escape! It doesn't matter if you're doing a PhD that might save the planet, you've got to look good as well. Young women growing up now are, as far as I can see, going to have an even worse time as they get older. So much more is possible now - surgery, botox, waxing salons on every corner ... there is now no excuse for being less than perfect or for allowing your body to grow old. I must say I very much admire you for resisting all that crap and showing your natural face and hair to the world but you did come across as a bit complacent. Can you not see that although you are doing a grand job of resisting the crap, it's getting harder and harder for women of all ages to do so?
I don't think irony works - it's given us Nuts and Zoo and rape joke t-shirts and we're all just supposed not to mind because it's ironic. Somebody ought to tell all those young women who are queuing up for surgery, starving themselves, obsessively whipping off every hint of body hair ... somebody should tell them they've got it all wrong! It's not serious, it's 'ironic', haha! Silly things. 
Anyway, welcome to MN and kudos for coming on to discuss this. Sorry you don't like our nicknames, it's just the way we do things here (at least mine's not silly
)