Many people asks this question. If you are getting delayed for your marriage and even after age of 27 if you are still waiting for marriage you must check with this yoga. Manglik yoga may be a cause of your late marriage but what happens if someone is not really Manglik and someone told him that he is a Manglik?
It happens when someone is really not experienced. According to my experience in Manglik Yoga you will be delayed for marriage and your marriage does not happen before age of 25. Stronger the yoga cause more delay in marriage. You need to keep in mind that if your mars is in first house of horoscope, in fourth house of horoscope, seventh house, eight or twelve house, you are Manglik.
But if Mars is in Aries, Cancer, Scorpio or Capricorn then you are partial Manglik. And if Saturn is also in the 1,4,7,8,12th house then you cannot say you are just 10% Manglik which does not affect your married life anyway. However it depends on the planets you have. You should not consider yourself Manglik by reading in books. You must check with experienced astrologer to make sure you are manglik or not.