This is fake. They haven’t been sat on that rock for 50 years. If you look closely you can clearly see her swimsuit is different in the second photo, it has stripes on it. And the guy’s shorts seem to have a more floral pattern in the latter photo.Also, if someone sat on a rock for 50 years, it would have made the news. My theory is, they simply returned to the same location 50 years later, and recreated the original photo.
“You will realise, that this combination of red-ochre, of green gloomed over by grey, the black streaks surrounding the contours, produce something of the sensation of anguish called ‘rouge-noir’, from which certain of my companions in misfortunes suffer.” ~ Vincent van Gogh to Emile Bernard