How to overcome age barrier in dating?

I've been seeing this guy for over a month now. I'm 21 and he's 27, we have many things in common but he is obviously more mature than me. I really like him and he says that he feels the same way but we can feel that there is an age barrier between us, especially when it comes to communicating virtually (text messages, chatting) like there's nothing to talk about, or he sometimes comes off as distant.

Communicating is a lot better when we're together, although I notice that he doesn't open up that easily. It's as if I need to warm him up or give him a drink before he loosens up. He told me that he usually has second thoughts about sharing because I might not understand (since I'm younger and all) I really like him and I am open to adapt his way of thinking, Can we work through this? How?
How to overcome age barrier in dating?
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