My friend in America, who was about your age, went to his doctor to ask for Viagra.
When the doctor asked ‘How many do you want?’, he said: ‘Oh, about six month’s worth - say a hundred tablets’.
When the GP had got over the shock, he wrote out a script for 100, which my pal duly purchased. He took one and suffered headache and nausea, so had 99 left!
He does very well on daily Cialis/Tadalafil 5mg, the randy old git - he’s 82 in November!