My partner and I (both 63) walked this last spring. We started in Montpellier and reached Castres 10 days later, with no rest days. I recommend Miam Miam Do Do and the Confraternity of St. James guide for planning purposes. We noticed the listings were not 100% percent correct, as some places had closed, but it's pretty good. It seems to me they list almost every available place to stay except possibly some local Chambre d'hote that don't advertise. Our stages were mostly 25 -28 k and included 600-680 meters of ascent and descent most days, sometimes more. I think the Le Puy route has lots of ups and downs, so that's probably not an issue for you. Except for the first stage of Montpellier-St. Guilhem, stages have no facilities between them that we noticed, except possibly water fountains. So you do need to be prepared.
We met very few walkers in May. One group found the walking difficult and cobbled together transportation with buses and taxis, so I know that is possible.
You need to carry the food you need for the day, but villages with chambre d'hôte or albergues generally have a restaurant and a footsore. The French village restaurants were a highlight for us and always very welcome. We usually booked a day in advance, because even with very few walkers, some villages had very few beds available. Also, we wanted to be sure the listed accommodation actually existed and was open.
The way is well-marked in general. You do go through forest and there are other footpaths that can be confusing. We met 3 people who had gotten off the correct trail and needed extra kilometers to get right again. We had one very wet day St. Guilhem to Blacquiere, and with very low visibility and a rocky, steep climb this day was difficult, and could even be somewhat dangerous.
It is a beautiful walk, but much more lonely than the Frances, and more difficult than either Frances or the Portuguese from Lisbon.
It's a wonderful camino for experienced walkers, but I think best to get the info from the guides unless you are really prepared to wing it.
Stages:
Montpellier-St. Guilhem
St. Guilhem-Blacquiere (there is a village in the middle called Peyroux with a restaurant and store but no lodging).
Blacquiere-Lodeve
Lodeve-Bosquet (there is at least one option for a stop between these two)
Bosquet - St. Gervais le Mare
St. Gervais le Mare - Murat
Murat-Salvetat (at Salvetat, only an albergue with I think 9 beds for lodging. There is a very nice chamber d'hôte about 5 k before Salvetat, but we didn't stay there so I don't know more)
Salvetat-Angles (at Angles only an albergue with 7 beds for lodging)
Angles-Boissezon
Boissezon-Castres (this is a very welcome shorter day)