The fortune teller said that I was destined to marry someone older than myself, but the person I like is younger than me. Is it fruitless?

You can't trust the fortune teller completely, it would be superstitious. If you really like him, get along with him and go to the end step by step. If it really doesn't work, the fortune teller is right. But you can't hold this kind of psychological object now, and there is definitely no result. Or follow your heart, no one can control your life, your destiny is in your own hands.