Around a thousand or two thousand years in the future technology has made amazing advances. The whole idea of having something like a phone or a pc was erased ever since nano machines and special implants people can just access the internet or a phone service just by thinking about it. Lot's of applications have been made including special augmented reality games, gps pathing, etc. However in this future some features had been made with the creation of space travel and colonization. Using special implants and nanomachines if a certain population has an imbalance in certain things like gender the machines can correct by changing gender of certain people. Old age also is no longer an issue with the nanomachines taking care of some of the problems that occur from aging, although death is still an issue since things like heart failure will still occur. Even people being born come with said implants and nanomachines since they are copied and created while the fetus is still being developed.
In order to make extra sure that these very regulated systems are not changed in anyway unless absolutely necessary there are several restrictions placed on the regulators, and most importantly it is protected by an unhackable security system that uses super intelligent A.I. who exist only to find and fix any holes in the security system making it practically impossible to get into the security system.
A lot of people were to speculate that if someone were actually able to breech the security system they could do almost anything. Not only would they have the skill to hack into any other system, but they could pretty much control any aspect over anyone's body at any time. If someone truly hated mankind they could just kill everyone off with no exception. They could overuse the deaging function and make everyone toddlers or infants. However if they wanted to live with a working mankind they would have to be subtle to not let anyone know the security had been breached.
Lucky for you you've found a way to hack into the security system and access anyone's body systems. However who are you?