About This File
There was a now deleted mod on Fallout 4 NexusMods called "Granny for CBBE" which had CBBE compatible textures for elderly women (Mama Murphy, Mrs.Greentop, etc). It had Old Skin and Young Skin options for download. This file is the Younger Skin version. Is it really 4k? I don't remember because it's been a while since I looked at that mod.