best friends ex boyfriend

so I am talking to this guy named Noah and he is my friends ex but I didn't know that and she found out we were talking and went crazy on me and said that I always go for her ex's cause I think I'm cute but here is the thing he is 3 years older than me and she is 1 year younger than me so their relationship was 4 years apart but.......... should I still date him please I need help