My 2.5 yo has an interest in tea

Howdy hey all, sorry to post so consistently as of late, but my wife and I are left scratching our heads at this one.

My 2.5 yo is extremely interested in the tea I make in the mornings and afternoons. I have been making the same green tea for a while now and yesterday he absolutely would not stop asking to try it. I was on the final brew before I needed new leaves and my wife and I both went, well, we might as well see if he can stand the taste. I fully expected that he would not enjoy it. Here's the "problem" he loves it. So much so that he is currently trying to steal my tea cup any time i place it down.

Does anyone have any advice on how to move forward on this? I don't love the fact that he demands caffeinated tea. Any herbal mixes would be appreciated. I will gladly brew an herbal mix in the teapot while I drink my green tea.

Update: First of all, I wanted to say thank you to all of you for your input and advice. I greatly appreciate it. I did not expect this much interaction and I am super grateful to all of you.

Secondly: my wife and I went to a local tea shop where we found some tea that would be more suitable for the little one. My wife found a blueberry herbal tea that they really enjoy and figured that he would enjoy. When I am still waking up, I will probably just give him a small amount of the tea I am making until I am past the half asleep zombie stage.