Studies show that the 4-5 year age gap provides the most stable relationship. Gaps more than 8 to 10 years show higher disillusionment, quarrels and disturbed interpersonal relationships, leading to separation and divorce Bigger age gaps might have worked well for some, but cannot generalise.

Is dating someone 5 years older wrong?

Yes, its correct that dating is not illegal. Thats because dating is not a specific act. Specific actions that are often associated with dating, like sex, can be illegal.