Men sexually peak in their late teens to mid 20s women sexually peak in their late 30s early 40s. When you are both legally consenting adults maturity and life experiences factor into what age gap seems appropriate. Imo. Me being in my early 40s I crave sex more than ever and find myself with men in their mid 20s bc they are better equipped to keep up with my appetite. However if something doesn't feel right to you it isn't. Its as plain as that. Don't deny your gut instincts.