I am looking to sell this climbing rope, but I am not quite ready. I would like to get your opinion.

I have an unused climbing rope, Mammut Granite, 50m, 10.5mm. The catch is that the rope is 20 years old. It has been stored in my house, and has been sitting in a closet - a cool dry place. It looks brand new. I no longer climb. I have not climbed in 20 years.

Would you trust the rope? Would you buy this rope? Any other aspects to discuss.