Age gap

So I’m 6 yrs older than my partner he is 20 I’m 26….

our relationship is healthy fun and exciting keeps me on my toes . We both expressed how much we love one another however he had a talk with his grandparents and it scared him . The topic of children and marriage . He feels he won’t be ready for that until 30 and he fears I will be ready for that in the. Next 3-4 years and he won’t be able to give me that …. We almost broke up over this but logically yes maybe we should end things but I love him and I can’t let go. I’m not too worried about having kids any time soon but being engaged maybe in the next few years idk . I told him look your mindset could change … when I was his age I was thinking the same thing I don’t wanna settle down till my late 20’s and here I am still in married and no kids cuz I put my career first and so does he. Idk what to do .