What age makes large age gap relationships ok? Can a 15 year old date a 21 year old with parental consent and is it "ok" ? Does it really matter at all in the long run? If love is real it can wait, but still be in a relationship. It seems the world is run on labels and it is not good for anyone. 6 years is not a long time. Waiting 2 years to be of age is not a big deal. But why is it so looked down upon in this society? It comes down to the opinion of the individual. I find nothing wrong with age difference in relationships, as long as the maturity levels are matched somewhat. Life isnt about trying to be perfect or being "accepted" I refuse to be "accepted"
Here's the thing. 6 years means a lot of extra brain development. The prefrontal cortex (the section of the brain that inhibits impulse control, aids in decision processing, rationality, organization, etc.) does not finish developing until age 23-25. Regardless of the level of maturity they show, people with underdeveloped brains have not reached their greatest capacity for rationality (regardless of what that personal capacity may be, and how rational they currently are, they still have miles of rationality to gain). A 21 year old, while not having reached their full capacity of rationality, has reached a considerably higher point in their capacity than a 15 year old. Thus, this presents an unfair advantage in terms of maturity. The more underdeveloped one is, the more vulnerable one is. Maturity levels can't actually be matched in that scenario.
Legally speaking, age 18 is the age that makes large gap relationship okay (except in states and countries where the age of consent differs, I suppose). However, on a logical basis, an 18 year old dating a 30 year old isn't likely to be a healthy relationship due to the development gap.