It would, obviously, depend on what you actually want to do. At your ages, it might not be a good idea to sell up in UK. You can get rentals very cheap in the area you want and, possibly, the rent you get from your home in UK would more than cover it. You will both get health care based on your husband's age so that shouldn't be a problem.
If you buy and sell up in UK, you may feel you wish to return to UK because of family, health care or whatever sometime in the future. House prices in UK are going up and up all the time. Buying a house here for around €150k (about £120k) whilst getting a couple of hundred for your place in UK might sound a good idea but the costs of buying and selling in Spain are quite high so you would be lucky to get a similar place back in UK if you wanted to move back in about 5 years or so.
On the other hand, if you've been looking around for 10 years you might decide you want to stay here so it doesn't really matter. I think you have to look at the fact that your husband is quite a lot older than you so would you want to stay here by yourself when the end (eventually) comes?
Personally, in your circumstances, I would rent. Even a very good property that meets your needs shouldn't come to more than about €700 a month including utilities. That's only around the £6,000 a year mark. I';m sure you could get at least that for your UK house to cover it and you'd still have somewhere to go back to..
If you did buy for €150k, your initial expenses would be around €20,000 or so plus, when selling, pushing the 10k mark so 5 years of renting would cover those costs. I doubt if Spanish property is going to rise that much in the next 5 years.
At the end of 5 years you would break even (except that your UK rental would exceed that amount) and still have a house in UK to go back to if you really wanted.
Normally ,renting is wasted money. In Spain, I don't think it is as prices do not rise on a daily basis like they do in UK and buying and selling prices are so much higher here.
Find somewhere in Rojales/Quesada to rent. Become a resident and live without the problems of price changes and currency fluctuations.