That is correct.
I am not sure how old they are, they were actually just an interim measure, but market conditions actually kept them in the fleet longer.
F-GHGI will be the first of four 763s to leave the fleet in October. It is currently the only one with a different seating configuration (and different engines as well) from that of F-GHGF/G/H. Currently, Ougadougou (OUA), Philadelphia (PHL), Cincinatti (CVG), and Boston (BOS) are the 4 cities served by the 4 767-300s and when 'Golf India' leaves, only the stations in the US will see the 763.
Another will leave in November, another in February, and the last in March. Cincinnatti will have the honor of retiring the 763.
This is per the Air France head captain of the 767-300 pilots.
The following link: http://airtransportbiz.free.fr/AFsection.html
has an interesting article on the 767-300 fleet.