Formal:
* કાકી (kaaki): This is the most formal and respectful way to address an older woman, similar to "aunt" in English.
* માસી (maasi): This is another formal term, often used for a maternal aunt.
Informal:
* આંટી (aanti): This is the most common and informal way to address an older woman, similar to "aunty" in English.
* બહેન (behen): This literally means "sister" but is often used informally to address older women, similar to "auntie" in some English-speaking cultures.
Other options:
* કાકીજી (kaakiji): This is a more endearing and respectful way to address an older woman, especially if you are close to her.
* માસીજી (maasiji): This is a more endearing and respectful way to address a maternal aunt.
The best way to address an older woman in Gujarati depends on your relationship with her and the social context. If you are unsure, it is always best to err on the side of formality and use "કાકી" or "માસી."