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Planned sex dose not work, it needs to be spontaneous, but it could just be his age and life style.
First dose he know your on here, if not then tell him you are here looking for help, he could try some DHEA just put that in the site search box and read first, before anything else, start low and buld it up to what he thinks is baest for him over some weeks, he could try erection tea or the 5'Gs just Google them and look for pegym, these are all natural things and not drugs and DHEA is a hormon replacement, after them the is cayenne, garlic and green tea, just Google them with ED on the end, lots of this you can read about on earthclinics ED page.
Good Luck