When there's a big age difference it can affect lots of areas of your life. For example:
If only one of you is at school, you might find it hard to find time to study. And the other person might not realise how stressful it is during exams, or that you need time to study or do homework
- the law
It isn't against the law to have an older boyfriend or girlfriend, but it is against the law for an adult to have any kind of sexual activity with anyone under the age of 16. This includes oral sex, and sharing sexual images. Or you might not feel ready to do some sexual things they expect you to
If one person is working or has more money, it can be hard to make decisions about paying for things
- going out
If one of you is 18 or over and the other isn't, it might mean that you can't go out together to places like pubs, bars and clubs. It may also mean you feel pressured to go to places you don't feel ready to
If one person is much older, they may have more experience, more knowledge and different expectations like buying a house and having children. They might feel more in control of these decisions.