Hi! I see he is much older than you, in those cases that means he has much more experience ( being Leo , for sure) and its more difficult to kind of... have control over the situation. But what I can say about Leo man is that they have this thing about needing to feel like a king. So they need to go for things which are a challenge because that makes them feel like they are going for " the best".Going for the difficult thing that not everyone can get, just kings.
At the same time they totally hate to be refused, more than other man, I mean if you refuse a Leo, prepare yourself... because leo with hurted pride really is terrible.
So I would say try to not make him feel that he very easily can get you, like... just by knowing how valuable you are and showing him you also have your own life, and that you valorize your own life too and may have other man wanting you too. Like show him, he has to earn you because you deserve it.
But do this without making him feel refused or without making him feel he is none for you, or without making him feel you for sure are with others.
Sometimes just by remembering all the cool things in your life which aren't depending on him, or just trying to not feel too dependent too early, you may naturally bring this feeling to him. I mean you don't need to say anything with words, just act like that.
And of course mix this with compliments sometimes or admiration when he is actually meeting you and interested on you, because he needs challenges but also he needs to know that if he has a relationship with you, you will honestly valorize him and admire him.
I hope it could help a bit!