This image is of the small shops that lined the Seine in Paris, featuring a very old man who was known as the oldest bookseller, referring to his age and not the age of the books.

The description states, in rough translation:
THE LITTLE TABLES
Quai Voltaire. The oldest bookseller of the quays. The poet bookseller Charles Dodeman.
The oldest bookseller.
–These sorts of stalls exist today along the Seine. Such sellers are known in French as “les Banquinistes”.
This postcard was used and is dated 25 July 1930.