Tingling in both arms could be a sign of arthritis near the spine. Tingling and weakness are signs of damage to the nerves. This can happen in the brain, along the spinal cord, in the peripheral nerves and at the nerve endings in the skin. A sudden onset of intermittent weakness and tingling in an 85-year-old could signal a transient ischemic attack, which is similar to a stroke except that it goes away — usually immediately but, by definition, within 24 hours. The nerves in the spinal column can be pressed on by arthritis, and it might be that this exists symmetrically.