I have remains in my house that are years old. Can I get "stones"? Is there a shelf life of ashes? April 30, 2020 17:35 Updated There is no shelf life for ashes, we can solidify them no matter their age. Related articles What amount of cremated remains do I need to send? I’m having a problem with removing my loved one’s ashes from their urn/box What amount of cremated remains are lost during the process? Will 100% of the remains be returned to me? Can I pick the size, color, or shape of my solidified remains? Can you process Alkaline Hydrolysis, water cremation, or green cremation remains?