Verb conjugation of "denigrar" in Spanish

The earlier you go to the top of the mountains the fewer people are on the slopes. I love the sound of the ski-lifts and seeing the villages disappear in the distance while I move up to the mountains.
After placing my luggage there I decided to walk into town and rent a bike. The neighbor of the guest house stopped me on the street and asked me if I was Mike. She told me that she was Luisa.
My wife and her started a nice conversation and the village girl did not believe that my wife was older than thirty years old. My wife considered herself as old, but the little girl explained her that she wasn't.