If you're 15 and your boyfriends older, does that mean you'd have a more committed relationship?

my sister is 15 and her boyfriend is 17 but she thinks because he is older he will be more likely to commit to her and be in a long lasting relationship... Idk what to tell her cause I have a bad feeling about it. when I was 15 I made the same dumb mistake but she won't listen ...

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