Resolves YES if there is a reliable and widely used medical intervention that reverses hair graying associated with aging. The intervention must cause existing hair follicles growing gray hair to instead grow repigmented hair closely matching the person's original natural hair color.

If the intervention doesn't repigment all of a person's gray hair, then this market resolves YES only if the treatment is able to reduce the number of gray hairs by >50% in most people. If this statistic is difficult to determine, I'll use my best judgement.

Examples of hypothetical interventions include, but are not limited to, pills, topicals, injections, and stem cell implantation.

This market resolves YES even if the intervention is not specifically targeted at reversing gray hair (for example, a general anti-aging pill that also happens to reverse gray hair would still count).

Hair dyes don't count as a cure or medical intervention.