Actually, the extract was probably the only part worth keeping. It gets darker with age, but unless the can is bulging, old extract is usable. Crushed grains are only good for a month, if they haven't been frozen. Hops might be ok, but the alpha acids break down even in sealed bags.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk