We were there last September. Been a few times now although I am unable to do the walk anymore due to Arthritis Mrs D did it and it was fine. Hard work in places. She also did the one up the top of the Col du Tentes which is at the top of the road above the Aire out of the village. If you havent done that one its a spectacular drive up and back down again. You can walk from the car park into Spain at about 7500ft.
Both the bottom car park and the big Aire 1km up the hill are all Pay and display now. Loads of space up top when we were there last September though. One of my favourite places on the planet.