I have long wondered what I would do if I was immortal. It is a wonderful thought to live forever and literally have all the time in the world. If I was immortal, I would want to remain the physical age I am now, but let my mind advance as the years roll by. We know how much history an individual would witness if they lived less than a century, but if I lived millennia, I would witness civilization and the universe evolve many times over. As for what I would do with all of that time on my hands, I would spend it writing until my head is empty of ideas because I have too many story ideas to write in one lifetime. Also, because Disney is going to expand the Star Wars universe forever and I am a devout Star Wars fan, I would read and watch everything they produce from it. In addition, I would travel the world every time it changes and draw more inspiration for my writing from what I would find. The possibilities are literally endless when you can live forever.
Even though the Young Guardians each have their own set of unique abilities, I gave them one power that they have in common: immortality. They are immortal in the sense that they will never physically age, never get sick, or die of natural causes, but they can still be killed if the physical trauma they sustain is great enough. In other words, even though they will not physically age, their minds will continue to sharpen as the years go by. With this power shared among them, they would truly be Young Guardians of society. I gave the characters this power because I realized that most superheroes would inevitably wither and die, leaving the world vulnerable to the wrath of evil. So with agelessness, the Young Guardians will be able to save the world for a good long while.