The legality of an age gap depends on the age of the individuals involved and the laws of the jurisdiction they are in. Here is what the search results show:

• If you are aged 12 or under, the law says it’s not possible for you to consent to any kind of sexual activity, and so no one is allowed to have sex with you or touch you in a sexual way.
• If you’re aged 13, 14 or 15, the law says that no one aged 16 or above is allowed to have sex with you or touch you in a sexual way, even if you consent. If both people are aged 14, or 15, the law says unless someone is not more than 2 years older than you, they’re not allowed to have sexual intercourse with each other or oral sex.
• The age of consent in the United States ranges from 16 to 18 years old depending on the state. Some states also impose an age differential, which is the maximum age difference legally allowed between the two parties if one is younger than the age of consent but older than the minimum age.
• It is illegal for someone over 18 to have a sexual relationship or sexual activity with someone under 16, or to have sexual activity with a minor, regardless of whether the minor consents to the sexual activity.

Therefore, it is important to check the laws of the jurisdiction you are in to determine the legality of an age gap.