1) When your wisdom teeth are FULLY impacted, they are completely covered and sealed off by the gum tissue. Food and bacteria can NOT get to the wisdom teeth; as such, you are extremely unlikely ( about 2%) chance of ever having ANY problems.
2) When food and bacteria can get to the wisdom teeth, BUT you keep the wisdom teeth clean.
3) You are over 30 and have never had problems with your wisdom teeth.
90% of the problems with wisdom teeth involve food and bacteria getting to the wisdom teeth, which causes cavities and gum/ bone problems.