Wholly, I do have to take issue with the assumption that older women enjoy relative privilege, particularly the statement "almost all of them enjoy secure accommodation that young women can only dream of."
Many women in their 50's plus that have married young, been caregivers for their children (and perhaps grandchildren), haven't worked much outside the home and/or sacrificed their careers to support those of their husbands. That means that if their relationships break down, they have few options for employment, have fewer resources to call up on for legal support, could find themselves homeless and isolated, particularly if their support network was linked to support for their husband.
Older women are more likely to be financially disadvantaged in terms of pensions because they are likely to have made lower and fewer contributions than men of a comparable age. If their spouses were the same age or older, they are likely to find themselves in the position of caregiver if their husbands become ill or infirm and/or be widowed by the time they get to the point that they need care themselves. And, age is no barrier to experiencing sexual violence or domestic abuse, but they may be less well equipped to do something about it, due to the stigma of admitting it that hangs over from social values when they were younger. And, will they believed? Even if they seek help, most women's refuges and rape support services are geared up for the needs of younger women, women with children, etc. Then of course there is the emotional, financial, physical and sexual abuse they can experience from carers.
I've done alot of work with charities that benefit older people (e.g. Care & Repair, Age Concern/Age UK, Action on Elder Abuse, etc.) and when they speak of marginalisation and disadvantage of older people, they are really talking about women in the main because women ARE over-represented amongst the elder population and ARE socio-economically disadvantaged over the men in their age group. In my view, issues affecting older people ARE feminists issues in the same way that say access to quality, affordable childcare is a feminist issue because it impacts most on women as parents.
I do think there is an issue of older women becoming "invisible" in society, but also their issues being invisible particularly to younger women and specifically to younger feminists. Maybe some of that comes from the perception that older women aren't so affected by sexism or exploitation or abuse than girls or young women. Maybe it's the thought that "they've had their innings," and attention should be focussed on younger women and girls with a future ahead of them. Maybe it's from frustration that older generations didn't do enough to challenge the institutions of patriarchy or the belief that they colluded with it, contributing to the disadvantage still experienced by younger women today. Maybe it stems from the fear that we're going to be old one day and not wanting to be reminded by the experiences of older women today of things that will happen to our bodies, our minds, our sense of self, our safety, our support networks, our place in society one day.
Several members here have said that they didn't really "get" feminism until they became mothers. For others, the penny-drop moment might have been getting passed over for a promotion in favour of a less-qualified man or experiencing a sexual assault. I think our life experiences are bound to shape what we see as priorities in our own lives and for feminism as a movement. I dunno, maybe that is what Mary Beard meant about her personally not getting as worked up about beauty contests as she did 40 years ago because other issues have come to the fore for her as she has progressed through life. Maybe not that's not it, I don't know.
I do think that there is more that unites us than divides us, regardless of age, ethnicity, sexual orientation, with children or childless, whatever our class, health, etc., whatever additional label we attach to our experience of feminism and whether we see ourselves as academics, activists or advocates. There are rigorous discussions to be had, but I wish more energies could be ploughed into collaborating to make a difference, in whatever sphere we occupy, to tackle the mechanisms of oppression and patriarchy itself.
But maybe I'm a pie eyed optimist! :)