I don't know if her behaviour was age-related. Maybe that's just the way she is? Just because she's had a mega singing career doesn't mean she has to be an engaging conversationalist. She seemed very uncomfortable to me (and not just physically) and unsure of how to behave. I think some of her comments were her trying to fit in, be ironic etc - but they just fell wide of the mark.
And of course most guests would contrast unfavourably to the adorable, totally at ease, entertaining, self-deprecating and charming Sir Ian.
Why she would force herself into that ridiculous corset though is beyond me.