Honestly, the very concept of being "too old for something" doesn't make much sense if you are to analyze it. Consider it rather like this: age is a concept invented by humans meant to measure the amount of years an individual has spent on the earth. With this in mind, by saying you are "too old for something," you are actually saying this:
"The amount of years you've spent on the earth at this point, exceeds the maximum acceptable amount of years allowed for harboring interest in this subject matter."
The reason why this is nonsensical is that interest is not enslaved to age, and need not be. Why should something you like suddenly be deemed an unacceptable interest due to your having been alive for "longer than what's considered acceptable?" The answer is that it shouldn't, because your interests aren't required to bend to your age. Having been alive for a longer amount of time than the person next to you is not, in itself, what's going to dictate differentiations in tastes, preferences, and interests between the two of you. In fact, there is an important distinction to be made here: while being "too old" seems to refer to the literal "amount of time" spent alive, what they probably mean to refer to is the natural change that can accompany that passage of time as a result of new experiences. Basically, I believe the initial concept of being "too old for something" comes from the idea that time gradually evolves your interests as a result of new knowledge influencing the direction of your thoughts. While I think this statement is valid, I think it causes people to jump to a false assumption that "phases of interest" necessarily MUST occur based on greater amounts of "wisdom" having been imparted to you over greater numbers of years. Basically, people seem to believe that you are obliged to "phase out" of an interest after having gained a certain amount of knowledge about the world. The problem with this assumption is that whatever "new knowledge" you gain overtime, easily can have absolutely nothing to do with any particular interest of yours, therefore needing not necessarily effect them at all. I realize that talking like this might be getting a little confusing, so here's an example to illustrate: The Wind Waker seems to be the main game being referenced here, so let's take that fellow game of ours. Let's say that at 15, you enjoyed the game due to your appreciation for the illustrative and expressive art style, charmingly cheerful atmosphere, and pleasurable and imaginative gameplay. Now then, say that in the six years following that, you have gained experiences about the world that have caused you to develop an interest in politics, avoid elevators because they make you uneasy, exercise weekly, and follow a diet. Well, let me ask this: is the addition of your interest in politics suddenly logically going to make you decide to backlash on The Wind Waker's art style? Is your fear of elevators going to make you dislike the laid-back atmosphere of the game? Is exercising and going on a diet going to lead to you to conclude that the gameplay isn't imaginative anymore? Well, compare these questions to this question: Is eating corn going to make you suddenly decide that you don't like wearing socks? Although I can't rule out the entire possibility of your brain finding a logical connection to connect one statement to the other, my point is that there's most probably not going to be any connection at all. If the new knowledge gained in those latest years has no connection to your appreciation of the game, why should there be any reason to alter your opinion of it into one of dislike, just because you are older?
Now, it's always possible for something to occur to trigger a change in your interests. I could be a meat lover at 15, but then suddenly become disgusted with it after gaining new knowledge of how certain animals are treated for slaughter, converting myself into a vegetarian in the subsequent years. Not only that, it's even possible for your interests to change on a simple whim; one day you might decide pineapple is your favorite fruit, and yet on another day lose interest in that in favor of grapefruit instead. However, such factors are independent of age; if in such a situation, you suddenly did drop interest in The Wind Waker, it wouldn't have had anything to do with how old you were anyway.
To sum up, you are going to like whatever you are going to like, whenever you are going to like it, and you do have the freedom to do so, so why force yourself to deny an interest of yours for the sake of obeying completely artificial, self-proclaimed, misplaced age restrictions?
There is no need. Your interests will come naturally to you, irrelevant as to the number that states the length of time that you've been alive. So, you should feel free to like what you do, and not allow unfounded pressures to get to you.