forgot you have been there. Location is huge for dating apps. You can be the best looking dude with the best profile and if there are no other users in range you are still fucked.And it's a pretty sleepy sparsely populated desert island, with the major tourist centers on his side being somewhat small, 30 mins away, and the other major tourist center being quite far, and his location being a lovely little sleepy town.
I would estimate, not an easy place to meet to meet chicks once over the age of 40 and retired.
I find it hard to believe the apps are going to come up with large-scale quality, however I could be wrong.
Maybe some loose pussy during tourist season to leave one's balls drained, genitals herpetic (yes you will still get the herp with connies), and soul unsatisfied.
I really think the best option is probably church, as @ElOgro mentioned and in turn getting involved with church functions. Socialization is a good thing and builds a network of connections.
Especially due to his location - small town, 20-30 mins to population centers.
Second is the apps, where your best luck is probably going to be a younger woman, not from the island, that likes older guys.
A big plus for him is the fact he's landed gentry.
Maybe he needs to import?