Thank you for replying back & providing more details.
The symptoms you have described of getting problem to maintain the hard erection is due to a condition called
as ED(erectile dysfunction).Its most common causes are: ageing,diabetes,hypertension (high blood pressure),cardiovascular diseases,cigarette smoking,nerve or spinal cord damage,low testosterone levels,certain medications,depression and anxiety.
Your elderly age along with diabetes,high blood pressure & heart disease can be the most probable cause.
You need following tests:
-Dynamic infusion cavernosometry(DIC) and cavernosography (DICC),
-Nocturnal tumescence test.
The treatment depends on the cause.It includes Oral medications like Sildenafil (Viagra),Tadalafil (Cialis),life style improvements (for example; quitting smoking, and exercising more).
So my best advise for you is to make an appointment with your doctor to have these tests done so as to know the exact underlying cause & hence the above described prescription medication accordingly.
Hope this helped
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