Just my 2 cents worth.
We were living pleasantly on around 18k sterling pa, in the beginning, it's now around 22k pa about 8 years on, there's my wife and I and our son. Elective things like home extension, new car or adding a pool are additional.
Mortgage free makes a huge difference, obviously, and my numbers include typically eating out on average twice a week, buying good fresh food, school uniforms and tuition and after school activity costs included.
IF you like being outdoors and hobbys like running, cycing, hiking, swimming, sports generally and so on the reliably good weather year round is brilliant BUT mid July to August are HOT so you either adapt and slow things right down, siesta, avoid the Sun as much as possible, plenty of floating in the pool or sea time... basically live like a local and you'll be fine or like a lot of older folks we know you travel for a part of the Summer.
We like the heat but everyone's different.
Ball park for 2 people ,30k pa in my corner of Spain presently would be a doddle for most folks I'd guess, you could even save money.