There are many nail colors suitable for a 50-year-old aunt, depending on personal preference and skin color. Here are some nail colors that are more suitable for 50-year-old aunts:

1. Dark reddish brown: This color is neither too bright nor too dark, which is suitable for people with darker skin.

2. light pink: this color is gentle and elegant, suitable for people with lighter skin color.

3. Light blue: This color is fresh and natural, suitable for all skin colors.

4. Deep purple: This color is noble and elegant, suitable for people with darker skin.

5. light gray: this color is low-key and calm, suitable for all skin colors.