God instructs the elder women or matriarchs to teach the younger ones in goodness. The reality is that regardless of your age, you are always a "senior woman" to someone—even if it's merely an adolescent.
Your life's example teaches others. Teaching through conversations and women's prayer groups or Bible studies—this too is a great blessing. If you strive to become a mentor to someone—if you make the effort to extend a helping hand to a young woman—this will be an immense blessing for you both.
Look around and see if there is a woman a few years (or many years) younger than you who needs a new Christian friend. Start a conversation with her, invite her for a cup of coffee or to your home. Then, as you come to know her in everyday life, show her and tell her what it means to be a pious woman.