The L word?

When to say L word. I'm 30 and he's 44, we've been dating for almost 5 months. It's not the first time I've dated some one with this age gap.
I'm afraid to say I first. But we are planning out future together like we should be doing in a relationship.
Our relationship has always been on the fast track it feels like. So I'm just hoping he says it soon. When did you or your bf start saying I love you?