Can A Four-year-old Bottle Of 800mg Ibuprofen Be Consumed?

This should be an easy question for you. I have little money, as I am disabled, so everything is precious to me in its own way. A four-year-old bottle of 800 mg ibuprofen showed up in my medicine cabinet, and as I have a bad back and arthritis in my knees, added to a rather physically challenging life as I have no transportation - at 47 I can still run like hell for a bus if I need it before it pulls away - so I get from place to place mostly by bus (includes walking) or by just walking, which at 4mph is still pretty slow, or bicycle, pull a cart I devised - 45gal tote roped to a mover s dolly- and a night at my apartment s laundry room and feet, body and upper and lower back is so exhausting and hard on me that I need 600-800mg ibuprofen before bed, to work all night relieving pain, reducing internal inflammation ---- finally, what this bottle of ibuprofen presents is a $25 bottle of medicine --- DO I DARE TAKE IT? I have use and need, but....? ........AFTER typing my question and entering my email address, I would have to pay as much for your answer as I would a large bottle of 200mg drugstore ibuprofen. I am so sorry that I did not get to contact you, if you ever even see this at all.