Samuel calls elderly people, "old geezers." this term demonstrates biased language based on

Age.
   Biased language are words and expressions that are viewed as biased, hostile, and destructive.They diverge from predisposition of free dialect or fair dialect. They can be right described as one-sided dialect as they incorporates articulations that belittle or bar individuals in view of age, sex, race, ethnicity, social class, or certain physical or mental qualities.