docs: def age(self):
          """
          Get the age of the PID file.
          """
          
          # Created timestamp
          created = self.created()
          
          # Age in seconds / minutes / hours / days
          age_secs  = time() - created
          age_mins  = 0 if (age_secs < 60) else (age_secs / 60)
          age_hours = 0 if (age_secs < 3600) else (age_mins / 60)
          age_days  = 0 if (age_secs < 86400) else (age_hours / 24)
          
          # Return the age tuple
          return (
              int(age_secs), 
              int(age_mins), 
              int(age_hours), 
              int(age_days)
          )