I am aged 73 and have a similar problem as I need insurance for 100 days in Europe. I have found staysure.co.uk who have quoted £71 for Europe. I suggest you try them, though I am still searching I doubt if I will find anything better.
If we lived in Europe prices would be much lower, generally we are being ripped off by greedy insurance British insurance companies. Staysure are backed by a Dutch insurance company, need I say more.
Best of luck,
ray7