Gary is high. Gary is big. Dave is tiny. Dave is thin. Alan is nice. Fiona is rough. Fiona is poor. If someone is not huge then they are rough. If someone is not bad then they are kind. If someone is nice then they are quiet. If someone is quiet and not sad then they are clever. If someone is rough and not huge then they are dull. All dull people are short. If someone is tiny and thin then they are sad. If someone is sad and not quiet then they are poor. If someone is poor then they are young. If someone is kind then they are wealthy. All wealthy people are smart. All clever people are old. 
Dave is not young.