How long should I wait for him to say “ I love you” ?

I’m 26 years old and my boyfriend is 53 years old. We’ve been dating since June 2019. I’ve told him I loved him already but he hasn’t said it back. He is literally the sweetest person I have EVER met but my mind just sometimes wonder if he will ever say it. He does show me that he cares about me but I just want to hear those words.