The term "old biddy" has often been regarded as derogatory, especially when referring to elderly women. If you want to show respect towards them, you can use some of the other synonyms commonly used to describe them. Some of the most used synonyms are senior citizen, elder, golden ager, old-timer, old dear, or old soul. Another synonym that can be used is mature lady, which is considered more polite and respectful. Other combinations might include "wise woman," "seasoned elder," or "experienced matriarch." By using these synonyms, you not only avoid offending someone, but you also show respect for the knowledge and wisdom that comes with age.