We went as a family ranging from 55 to 22 and all thoroughly enjoyed it.The trip was just for our family as 8 was the maximum, we went in 4 double kayaks..
Hetty was a brilliant guide and had us all up to scratch in a matter of minutes with our sea kayaking. A reasonable level of fitness is required but not excessive, or if you had one fitter rower in the double kayak that would probably work well with an older less fit person.
Highlight of our trip was seeing 2 seals. The coastline and caves were beautiful. We also parked up the kayaks in a cave then swam round through another cave to a cavern.