A simple status or greeting line with a memento mori in it.

README.md

Stat Mori Fish

Days of productive life remaining. Demo

Installation

Download, chmod +x stat-mori.fish and put it in your PATH

fish is required to run this script, but doesn't have to be your SHELL to do it.

stat-mori.fish

#!/usr/bin/env fish
# lifetimer 3000 weeks where 1/2 is at 32 years of age, starts at ~3¼ y.o.
# i.e: Day 8375/10,500 · 1196/1,500 weeks · 275/345 more months · (since 2016 1/31)
# v0.3 gist.github.com/godDLL/b198f3311086491a5778035162653cd5
#

set -q YOB ; or set -l   YOB 1984
set -q DOB ; or set -l   DOB 01/23


set -l NOW  (string split -- ' ' (date +%Y\ %j))
set -l tDOB (string split -- '/' $DOB)
set -- tDOB (math -s0 $tDOB[1]'* 30.4375 - 30.4375 + '$tDOB[2])

set -l tDTL 10,500
set -l tWKS 1,500
set -l tMOS 345

set -l BY (math -s0 $YOB' + 32')
if test $BY -ge $NOW[1]

   set BY (math -s0 $YOB' + 17')

   if test $BY -ge $NOW[1]
      set tDOB (math -s0 $tDOB'+ 92.25')
      set BY   (math -s0 $YOB' + 3')
      set tDTL 21,000
      set tWKS  3,000
      set tMOS    690

   else
      set tDOB (math -s0 $tDOB'+ 228.75')
      set tDTL 15,750
      set tWKS  2,250
      set tMOS    517½
   end
else
end

set -l DTL (math -s0 (string replace -- , '' $tDTL)\
           '- (('$NOW[2]'- '$tDOB')+ 365.25* ('(math $NOW[1]'- '$BY)"))")
set -l WKS (math -s0 "$DTL /7")
set -l MOS (math -s0 "$DTL /30.4375")

switch "$argv"
   case '-x'
      echo $DTL $WKS $MOS
   case '-p'
      set -l POH (math -s2 '100/ ('(string replace -- , '' $tDTL)' /'$DTL')')
      echo -e \e\[2mDay \e\[m$DTL\e\[2m/$tDTL · \e\[m$WKS\e\[2m/$tWKS weeks · \e\[m$POH\e\[2m% left · \(since $BY $DOB\)\e\[m
   case ''
      echo -e \e\[2mDay \e\[m$DTL\e\[2m/$tDTL · \e\[m$WKS\e\[2m/$tWKS weeks · \e\[m$MOS\e\[2m/$tMOS more months · \(since $BY $DOB\)\e\[m
   case '*'
      echo 'USAGE: stat-mori [-x]'\n'Print a memento mori. Please set YOB and DOB.'\n\t'-p  for PERCENTAGE in place of MONTHS, or'\n\t'-x  for export: DAYS WEEKS MONTHS' >&2
end #switch

License MIT, free to do whatever. Yours to fuck up.
asciinema.org/a/450958

v0.3 added percentage

If you're over 32 percentage drops 0.01% every day, except for every 21st day.