Rapid aging

I had to keep Cassius talking.
"What happened to you?" I asked him a moment later, opening my eyes. I'd read somewhere that people love to talk about themselves. "The last time I saw you, you could have passed for forty."
Cassius stared at me for a moment more, and then leaned his bat on the floor. "It was the result of losing my coin to you and your friends," he said, voice creaking. "While I held my coin, Saluriel prevented age from ravaging my body. Now nature is collecting her due from me. Plus interest." He waved his stiff-fingered right hand, wrinkled, spotted, swollen with what looked like bad arthritis. "If she has her way, I will be dead within the year."
"Why?" I asked him. "Isn't your new demon stopping the clock for you?"
His eyes narrowed, unsteady and cold. "I have no Denarius now," he said, his voice low and very polite. "When I eventually left the hospital and rejoined Nicodemus, he had no coin being held as a spare." Mad fire flickered through his gaze. "You see, he'd given it to you."


Dead Beat Chapter 37, Page 332