I would like to advise you to keep options open. My sister has lived in Grecce for 12 years, myself only 3. (both Uk raised, with greek husbands). Recently i lost my job as an english teacher because my greek was not good enough! The ministry of education require a paper this year to prove greek ability in order to teach.
Money is not an issue (if you can teach, private lessons can bring in enough money). It is important to get in to the system (pentions and health). If you want to retire here.
I dont know if i can help you, but perhaps i can offer you some contacts