There is actually a market for this.In Australia they used to have a special Visa for people that wanted to spend their retirement age in the country, they pay a fair amount around $250K and are then looked after by the state.
Maybe we should also start something similar and let the elderly people speed their twilight years in the peaceful North as long as they bring in their wealth with them.
Many people rent out their homes in the UK and use the income to go and live abroad where the cost of living is lower.
The risk is that some 20 year old will marry her in the hope of an American visa.She is 80.....what risk is she. Let apply common sense