So I remember watching this movie where the premise was that the main characters each had superpowers and they would all die when they were quite young. They took drugs to help this and as they came closer to dying they would take more and this is what would eventually kill them. As I said in the title the powers kept growing as the characters age and they are killed off by a central organisation that helped raise them so that the guy in charge would be the only one who was powerful. I think the organisation was also a school/orphanage and that this was where one of the final scenes took place which was a battle between the head of the organisation and the main characters, one of whom had gone rogue by stopping to take the medication that they were given.

Thanks for the help guys. This has been irritating me for ages.