SCP-OC-71276 also known as The Time Slime is a lime green slime that barks, purrs, and yes can freeze your cells in time causing you not to age both physically and mentally.

SCP-OC-711276 is safe, and plays favorites among the staff and other SCPs. It can only stop your cells in time if injected into the bloodstream.

Also works as an emotional support slime like SCP-999, but has not abilities like SCP-999... It's just nice to pet and cuddle.