You are 30 yrs old you have 3 inch penis can you satisfy your wife if no please tell you what to do?

Unfortunately you will not be able to satisfy your wife, or any woman, sexually with a 3" penis. You will have to work on your other skills such as touch, caressing, oral, etc. Even 2 inch penis is long enough to reach the G Spot, so work at it - you will be able to satisfy her. Good luck!