There are no "rules" to how long you live with your parents, and anyone who says otherwise is a moron. There are very few people in this world who will be prepared to give much of a **** about you besides your family and blood, and if a person needs help with their living situation for longer than is "average", for whatever reason, then as long as both they and more importantly their parents are cool with it then who is anyone else to judge. Yes, it's not going to look attractive to many women if you are still living with your parents at 30+, but better to have a good standard of living then be in a rathole that you can barely afford. 
