Two points of added information, off the top of my head:
1) Plummer is still acting full time, he has four or five films either filming or in post-production currently.
2) He really, really, really hates The Sound of Music.
For Julie Andrews most people just remember her from Sound of Music or Mary Poppins whereas Plummer's been working solidly on at least a couple of movies a year playing a variety of roles. But because he plays a variety of roles you don't generally automatically see him and think "oh that's the guy from Sound of Music". Andrews usually plays characters where there's a passing reference to Sound of Music or Mary Poppins, or she's parodying either character.
Yeah, but she had a spell of getting fed up with that and countered the cute image by getting her tits out on screen, didn't she?
That was in 1981 in the film S.O.B.
I thought it was Victor/Victoria?
You see, I also thought she got her baps out in "Victor/Victoria", but apparently memory was playing tricks on me. Thankfully, the internet's got us covered: