FMSD 20.1:5 :ܠܐ ܚܕܐ ܫܥܐ ܙܥܘܪܐ ܕܝܒܛܠ ܠܗܕܢ ܪܝܫ ܣܝܒܘܬܐ ܡܢ ܬܫܡܝܫܗ‏ : not the slightest amount of time could keep this hoary head from its/his/ service
See the entire entry for saybū/sēḇū, saybūṯā/sēḇūṯā n.f. old age