Hi @melly2010 😊
My understanding is that 74 years old is not considered too old for a kidney transplant. (Most kidney transplant patients are over 65 years old).
Of course your Dad will need to go through the physical work up (cardiac stress test, blood and urine lab tests, lung xrays, abdominal CT, etc.) as part of the process. Is your father in pretty good health except for the kidney failure? Did your Dad start dialysis?