Everybody knows that Nick Fury took the Infinity Formula. But I was confused on an issue regarding its effects on Mockingbird and Bucky. Recently Mockingbird was saved from near death with Superia's combination of it and the Super Soldier Serum. And Bucky was saved with the last dose of the Infinity Formula. However, this is where it gets confusing, when Mockingbird was saved it was heavily emphasized that her aging would retard like Nick Fury's. However in the Bucky story Nick Fury that his not aging is only a result of taking regular doses for decades, and now he doesn't need it because his body regenerates it. So that logic contradicts itself if Mockingbird could receive longevity with one dose and Bucky would not.