We just returned from this exact route the end of July. We used a service, though, which transported our gear each day to our next hotel, so we didn't stay on the road in tents or in hostels. We are in our 50's. Both of us are avid hikers and backpackers so I was surprised when I ended up getting blisters starting day 3. My girl did much better foot-wise than I did. However, it was clear from our 6 days on the Camino that many, many people were in trouble with their feet. Anything from a blister or two to massive foot infections and knee injuries. In fact, we were surprised with "Camino Taxi" numbers posted alongside the trail but in fact more people call a camino taxi than you might think. My theory is you don't just walk on a country dirt trail. You pound on cobblestone, pavement, rocks, gravel, soft dirt, hard pack dirt, and more. Those surfaces kind of tricked me and I ended up using a lot of moleskin and also discovered "Compeed", a gel moleskin, which you can find in most villa pharmacies. So make sure your hiking boots are in good wear, try to toughen your feet as much as you can, and consider using a walking stick or trek poles. We took our time and enjoyed each day on its own. The younger crowd was bent on hauling to their day's destination and by the afternoon, we usually found the trail quiet and usually found ourselves hiking for a few hours never seeing another pilgrim. We stopped at most forest and roadside cafes, and as soon as noon hit, we switched from coffee to the great Spanish tap beer. Grab plates of octopus (pulpo) when you can! More than anything, enjoy.