I agree with the sentiment - I do think women get a harder time about it - especially towards the twilight of their careers - than men do.
However it's funny to bring Dylan and Neil Young into it. I saw them both 4 years ago in Hyde Park and I was alarmed at their joint top billing, because I feared that Dylan would go on first and I'd have to suffer through him to get to Neil Young. I am a fan of Dylan's albums from his heyday, but now his live shows are something to be endured and only celebrated by his hardcore fans, whereas Neil Young is still a powerful live act and can still provide the "Holy sh1t!!!" moments. His Glasto 2009 set was an all-timer.
I guess my point is, plenty of people (myself included) have publicly said that Dylan is a dire live act now. And nobody is asking Neil Young to hang up his hat, because he's still rockin' in the free world (sorry).