Don Lemon apologizes after 'inartful' comments about 51-year-old Nikki Haley, who he said 'isn't in her prime'

• Don Lemon said presidential hopeful Nikki Haley, 51, "isn't in her prime" on CNN on Thursday.
• "A woman is considered to be in her prime in her 20s and 30s and maybe 40s," he said. 
• The anchor later apologized for his "inartful" comments about women's ages.

Don Lemon quickly walked back his Thursday morning comments after he suggested live on-air that GOP presidential candidate Nikki Haley, 51, "isn't in her prime," in a diatribe that rankled some of his CNN colleagues and viewers.