This is inherently untrue in so many ways, and an example of that is myself. I began playing Kingdom Hearts when I was 17 (2 years ago) and ever since then I was able to experience the entirety of what Kingdom Hearts had to offer. You’re never too late to play Kingdom Hearts.
The thing about Kingdom Hearts is that if you didn't get on the train in the 00's, then you simply are left behind. It is too corny to work without the context of operating in a world of myspace-era truthisms, and its thrills can be found in other franchises with less homework.