Hi
Went on the CROATIA & THE MAKARSKA RIVIERA holiday last year. Loved the country so much, I'm returning this year on a different trip !
Age range varied from early 50's upwards, majority were female. There was even a young lady in her 20's !
The pace is easy going, not too many steps (unless you choose to walk up to the top of landmarks !).
There's quite a long walk, along a flat coastal path, for the boat trip to Hvar/Brac. Also, there a few steep steps up to the cheese factory on Pag Island.
Both hotels are nice, Pinija better of the two for food. Bluesun Resort food isn't great, but location is fantastic.
Hope this is of help.