The first important step is to recognize this type of bias exists. A corporate awareness and sensitivity to this issue is critical in order to create an inclusive work environment that spans all generations.
Review your job postings for subtle ageist content. Review the data of new hires and terminations to see if there are trends that reveal gendered ageism. What percentage of your older employees who’ve been let go are women? Is there a pattern? Create a safe environment for discussion groups and open forums for older female employees. One common complaint I’ve heard in my many interviews with older women is that there is no one to talk to about their issues. Human Resources doesn’t acknowledge or follow up on their complaints and they feel hopeless and isolated. They’re worried about their financial future and have no one to turn to for support.