How soon to say 'I love you'?

I(F58) have only been on two dates with M(45), and we're already getting tested for STIs with a view to a sexual relationship. We are crazy about each other. Met on Tinder two weeks back and have had 4 long phone calls as well as many texts plus the 2 dates both of which went for hours cause we didn't want it to end. We have talked about literally everything: interests, work, family, philosophy, politics, religion, we are on the same page and we have both confessed that if we were alone together in an appropriate place, s%x would happen, but we want to take it slow. He's gorgeous and he's everything I want in a man. I adore him. How soon is too soon to say ILY?