Fasting For The Senile

We seek your guidance for the following situation.

My wife, 67 years old, had a coronary by-pass a few years back and now recently has been diagnosed possibility of clot in her legs. Besides she is weak as well.
I have survived colon cancer recently. Our physicians are non-Muslims so we cannot discuss the fasting with them. We intend to skip fasting this year and as compensation send money to Pakistan for giving it to the needy there. Kindly advise what will be the amount for each of us. I am 78 years old.
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