Depending on the age of your older guy, he may have grown up in an entirely different decade than you did.
As a result of the age difference, he may like different music, books, movies and television shows. Your interests may be completely different, and the two of you may have a difficult time connecting on a shared activity. When talking, he may make references to shows or events that you don't even remember, so it could be hard to find common discussion ground.
Not Ready To Commit
If you are looking to settle down and have a family, an older man may not be the right choice for you.
He could have been previously married, and now he is hesitant to pursue a serious relationship. Or, even if he is open to marriage, he may already have children and not be interested in having more. An older man may feel that he's already put in his time raising children and may not be interested in starting the process once more.
He Wants To Teach
If you feel like your older guy spends most of the time trying to teach you about life and, specifically, your choices in life, then you need to evaluate the relationship.
Just because you're younger, it doesn't mean that you need to be schooled by your guy. Some older men feel that they have more knowledge about life based on their experience, and they spend too much time trying to mentor their partners instead of actually being in an equal relationship.
He Really Only Likes Younger Woman
If your older guy only dates women who are twenty-five or younger, then you need to find out exactly why this is the case.
Eventually, you won't be twenty-five. Will he stop dating you at that point? If you think that your older guy is just constantly trading in for a new model when it comes to women, then this should be a big area of concern for you. You don't want to be his young flavor of the week.