You can:make coffee ice cream with thembrew them and use the coffee in bakingkeep them in your car as an air freshenerdip them in chocolateexperiment with different manual pour-over techniques
Is drinking old coffee bad for You?
How old should you be to start drinking coffee?
400mg for healthy adults300mg for pregnant women2.5mg per kg for children and adolescents
Can old or stale coffee make you sick?
Old coffee beans aren’t dangerous to your health by themselves. They’ll taste stale and weak, but they’re not going to make you sick on their own. However, there are some things about old coffee beans you should be aware of. Some of those things might make your stomach turn.