Hi Seredendipity7000 thanks for your reply. I really do hope he's just fine and the reason is really old age.
About the excess skin on his neck i tried touching it this morning and the texture is soft and i didnt feel any nodes/lumps. Also, the other day i've noticed that he's touching it while he's grooming and he even attempt on grooming that part. Btw, his teeth are just fine, they have not overgrown.
Alsk, he can still walk without falling but with a little bit of curve at his back. He's also very attentive especially when his fellow hamsters are making noises. He even tries to get out of his cage by climbing.
I've seen a video (link posted below) which is somehow related to the breathing of my baby. I hope its just normal.
https://m.youtube.com/watch?v=rADxVRSCBMA
Do you think its a good decision to bring to the vet? To make sure that the excess skin on his neck is not a lumps/tumor?