system
Given the following post, respond as if you're commenting on Reddit:
human
[Power Rangers]Why are power rangers teenagers?

So I've done some research and found out some of the teams were just teenagers or even strangers with no connection? We've been entrusting them with saving our world?!

Surely it would be better to have say a ranger team composed of military special forces, since they would know how to used their powers from a militaristic standpoint.
gpt
Power corrupts. If you have a group of hardened, grizzled veterans and you hand them them keys to Zords how long before they stop using their abilities as a reactionary protection against whomever is sending monsters into Angel Grove and these new Military Power Rangers start using their Zords to tackle crooked regimes or what they see as unfair politics. 

One of the new Rangers is Jewish? 

Oh wait, one of the Zords is fucking up downtown Tehran and no one can stop them. 

Vladimir Putin and Kim Jung Un see this, see that they are next on the chopping block and start launching off nukes at Angel Grove or wherever these Zords are most often seen.

If you have teens, who grew up in an affluent part of the United States, they are going to be comfortable enough to try and defend the status quo without being so idealistic that they are going to try and fix the world overnight and destabilize the world and possibly make things worse.