Here are the corrections for the mistakes in the sentences:

1. **Jog** is good exercise for the elderly.
- Correction: **Jogging** is good exercise for the elderly.

2. I have a **headsore** now.
- Correction: I have a **headache** now.

3. Lack of exercise is **harm** to your health.
- Correction: Lack of exercise is **harmful** to your health.

4. Should I **eating** tofu?
- Correction: Should I **eat** tofu?

5. If you **eats** a lot of sweets, you will have a toothache.
- Correction: If you **eat** a lot of sweets, you will have a toothache.

6. **Not stay** up too late, Kim!
- Correction: **Don't stay** up too late, Kim!

7. The colour indicates when the **fruits is** ripe.
- Correction: The colour indicates when the **fruit is** ripe.

8. Cold weather **results from** chapped lips and skin.
- Correction: Cold weather **results in** chapped lips and skin.

9. My mother usually cooks food with very **few cooking oil**.
- Correction: My mother usually cooks food with very **little cooking oil**.

10. We should have a **balance** diet for a long life.
- Correction: We should have a **balanced** diet for a long life.