TgPs92:15 :דהינין ורטיבין יהון‏ : may they be fat and moist
See the entire entry for dahhīn adj. fat

TgPs92:15 :בשיבו דהינין ורטיבין יהון‏ : they will be fresh and moist in old age
See the entire entry for saybū/sēḇū, saybūṯā/sēḇūṯā n.f. old age