Chade has always been described as old, even in the first books. I just finished the Tawny Man Series ending with Fool's Fate, and other characters are either growing old and frail
such as Burich and Patience, or Shrewd in the first books or dying of old age (Lacey).
I find this hard to believe as these characters were always depicted as much younger than Chade in my opinion. Of course, this can be explained through some reasons:
- Shrewd was being drained by Galen's false coterie
- Burich only seemed old because of his leg and blindness
- Chade uses the Skill to renew his health
But how old is Chade at this moment? I tried searching on the wikia but I am reluctant to continue after finding a rather big spoiler...