.


Joan Collins did her PLAYBOY nude photos in the Dec 1983 issue. So she was exactly 50 when she posed for them.

https://www.playboy.com/magazine/issues/1983/12


If you page backward to the Nov 1983 issue, it looks like she was also on the cover of that previous issue.


Unrelated, browsing many other photos of Joan Collins, this one in particular struck me, that I might have to pay money to buy, she's so sexy :
https://i.ebayimg.com/images/g/80cAAeSwda5n5AN2/s-l1600.webp

and
https://picclick.co.uk/Joan-Collins-Dynasty-Colour-10x8-Photo-267107543566.html


That I found on this site
https://picclick.co.uk/JOAN-COLLINS-10-x-8-Colour-Photo-177373285027.html