Well, basically as one gets older the plumbing starts to not work as well. I know that there's plenty of different directions to take, as far as getting stimulated... but since I'm not a man and not 72 years old I don't know anything first hand. I do know that penis pumps are used as erectile aids in combination with a cock ring (to keep the pumped blood in the penis) but that can be a little too much work for some people.
Other than that... try the normal stuff. Porn, lube, vibrator, wife... that kinda thing. Also, don't be afraid to talk about this with your doctor- he can help you figure out if it's a medical cause or just a "getting older" kinda thing.
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Sage knows our mythic history, King Arthur's and Sir Caradoc's
She answers hard acrostics, has a pretty taste for paradox
She quotes in elegiacs all the crimes of Heliogabalus
In conics she can floor peculiarities parabolous -C'hi
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