Why did he say "but you are older than me" when I confessed that I like him?

we are friends online. i am one year older than him. he flirts with me. and he texts me a lot. yesterday he asked me if i have fallen for him. but when i told him that i like him his response dissapointed me. he also said "how can u love a kid". why did he say that? does he feel uncomfortable that older girl likes him?

Why did he say "but you are older than me" when I confessed that I like him?
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