If you drove someone else car and they did not have car insurance but you have car insurance will your car cover the damges of the uninsured car?

If you drove someone else car and they did not have car insurance but you have car insurance will your car cover the damges of the uninsured car?
If you're over 25 and have comprehensive insurance, you're covered third party only on other cars, so it wont cover the damages of the car you were driving, but if there was a third party involved they're covered.