Moar Nano brainstorming and Twewy speculation
Moar tl;dr on stuff that's not really significant? idk anymore

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So, I noticed that on the Twewy wiki reapers have their ages listed down and it kind of surprised me how young they are. I mean. Yodai aka BIG GUY aka RAM CROTCH is twenty. TWENTY. I guess I can sorta see it, but Kariya is also only 19, and it's implied that he's been a Reaper in the Game for quite a while (at the very, very least, 2+ years, since Uzuki was around 2 years ago, and he's been in the Game longer than her) to have seen a Taboo Noise incident.

Does this mean Reapers stop aging once they become Reapers? Or are they able to control their aging? The Secret Reports say that Reapers have an extended lifespan, but I've sorta kinda wondered how many Reapers actually get to live to their full extended lifespan. It seems to me that Day 7 in any standard Game is when the GM (and other Reapers) are allowed to get hands-on in the Game. If Day 7's mission is always "Defeat the GM", then for there to be any winners, the GM will be erased. Which means either the Reaper team tends to go through GMs rather quickly, or the Game is just insanely hard to win and it's far more likely for the Players to be erased.

I'm more inclined to the latter, myself.

If it really is a case of Reapers not aging, or just aging slower than normal humans, then it'd totally suck if you were killed early or late in your life. But all the Players and Reapers in the Game are relatively young. Is that a coincidence? Or simple a game mechanics thing, since apparently old people in video games just ain't cool, in general :| Assuming that it's not a game mechanics thing, maybe you can only play the Game between a certain age range. I think past 42 might be outside the Game's juristiction |D

Let's assume Reapers just age slower. What about the Composer? Does the same rule apply to them when they are in Composer mode? If we take Joshua as an example, his full Composer form looks about 19-21? But his down-tuned self is stated to be 15. My headcanon has always been that Joshua's full Composer form is his true age, and his down-tuned self is when he died. But then here is when I start running into timeline issues, mostly using Kariya and Uzuki as basis, since they're the only ones we have any idea of how long they've been playing the Game.

Now, if Kariya's been playing the Game for a while, he probably either started playing before or at the same time as Joshua did. Yet Kariya is supposedly 19 during canon. Unless... if Kariya started playing at the same time as Joshua, and Kariya died at around the same age as Joshua did...

... hey did I just solve the problem? \o/

Maybe for every 6 years, Reapers only gain 4 years of age? I guess that works hummm.