@Cyoteblack Oddly enough, in our world, yes, it actually is in alot of countries that don't have a provision for individuals who are reasonable close in age (known collectively as "Romeo and Juliet laws").
Note, some of the ages allows may shock as to how low they are for legality. Not surprising is the fact that sex is essentially illegal in most Muslim-dominated countries outside of marriage, and they have an age requirement (or have it listed). Highest age I saw for legality was... 20. Yes, 20 - in S. Korea. DO note that just because it is "legal", the age minimum can be different due to the relationship between the two people.