What is that white liquid that comes out of my hamsters left eye?

ANd my hamster breathes hard after he mates. Whats up with that? is he to old or just tired?What is that white liquid that comes out of my hamsters left eye?
The white liquid is one of two things- either your hamster has a cold or it has hurt it's eyes somehow and now they are flushing themselves. Does your hamster sneeze? If so then I would say that he just has a cold. Also your hamster is breathing so hard because they have a fast metabolizim that results in a fast heart rate. Well when you exert yourself what happens, your heart pumps faster. The faster the heart pumps the more oxogen that is needed, i.e. harder and faster breathing.What is that white liquid that comes out of my hamsters left eye?
Quit putting him in your Ace.
If he has any liquid coming from his eyes (or nose) that is any color but clear, I would get him to the vet. This sounds like it may be a mild form of conjunctivitis, which is treatable with anti-biotics. The vet may give you an oinment or cream to put directly on his eye to clear it up. Something as small as this could easily turn into a more serious condition, and may also be contagious to any other hamster you have in with him. the heavy breathing may be a sign of an upper respiratory infection, which can also cause discharge from the eyes and nose. I would give him a break from the mating for now. And if you can't afford to get him to the vet, try supplementing his water or food with extra vitamins (affordable and easy to find at any pet supply store). You can also try putting his cage in the bathroom (not in the bath tub) and let the shower run on hot. The steam in the room will open up his nasal passages and ease his breathing a bit. Good luck with him and I hope this helps!
It could be tears, and maybe he's tired of mating so much!