I want to stay in his mind 24/7, I want him to remember me all the time?

I liked him for a while and i was always observing him. Then I realised that he's interested in me by his behaviours. So I decided to talk to him and I did. 2 days ago I texted him with a random question then he answered this and he said what does that have to do with anything and I said "nothing, I just texted a random question to start a conversation. Anyway how are you"
He laughed and said I'm funny and then he said the way I started to the conversation was so cute. So yeah we are talking now but he's a bit busy. He had a long flight yesterday and we couldnt talk too much. Today he landed so ofc he's so tired and need a rest and yeah, couldn't talk too much again lol
I want him to remember 24/7. Is there any way to stay in his mind?

Ans by the way another question, he still doesn't know my age. I'm 20 he's 27, do you think he could see it as a problem?
I want to stay in his mind 24/7, I want him to remember me all the time?
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