Should I drink this?

[dsmarchl]

My wife and I found a bottle of wine at her dad's house and he gave it to us. It is a 1991 Mendoza Malbeck Varietal red wine. The cork looks a little rotted and there are a few small chunks that float to the bottom, but other than that, it looks normal. I just don't know if I should open it, or just keep it around. Can anyone help??