1. Color: Fresh limes are typically a vibrant green color. As they begin to age, they will start to turn yellow or even brown.
2. Texture: Fresh limes should be firm to the touch. As they age, they will start to become softer and may develop wrinkles or bruises.
3. Smell: Fresh limes have a strong, citrusy smell. As they age, their smell will start to fade.
4. Taste: Fresh limes have a tart, acidic taste. As they age, their taste will start to become more bland and watery.
If you are unsure whether or not a lime is fresh, it is best to err on the side of caution and discard it.