Is my boyfriend too immature for me?

I am 27 and I have been in a relationship with a 23-year-old guy. He treats me well and makes me happy compared to all the other men I have met but I find him too young and somehow immature in the things he does. We recently lost a good amount of money after he was conned in a funny way. From then on, my attraction towards him went down and I am not sure we can go far with this age difference. Many times, I feel like I am pressuring him with things that are beyond him like having a child, marriage etc. I am not sure about this and need your help. Please advise me.