The Rejuvenation Trilogy

The Melter War has left the Earth's surface devastated, leaving humanity to survive on what little land is left between the Scorch Zones and the rising oceans, where towering subscrapers dot the dystopian shore lines. Bobbie Chan is a doctor caring for the ultra-elderly in one such subscraper when she notices a mysterious new disease afflicting her patients; some show signs of age reversal before a catastrophic, and often fatal, cardiac arrest strikes. 

Bobbie Chan has escaped the clutches of the all-encompassing Belus Corporation and she, and her comrades, are forced to seek sanctuary amongst a band of renegades - outcasts who eke out a meager existence in the barren wastelands which emerged from the Melter War. However, Bobbie finds herself at the heart of a game plan, devised by the renegades, to bring the Belus Corporation to its knees.

Out of a clear, blue sky, a mysterious alien race wreaked havoc on planet Earth, thus beginning the Melter War. Millions of people died. But a savior emerged; Lisette Fox and her Belus Corporation supplied the weapons and technology to defeat the Melters and brought peace back to the world. Some two decades later, Bobbie Chan, a child at the outbreak of war, now works as a doctor caring for the ultra-elderly. Bobbie encounters a previously unidentified disease, Rejuvenation, which makes the old young, but has homicidal side effects.