Hello
Premature greying of hair has multiple causes:
1. Genetics
2. Nutritional deficiency
3. Environmental factors
4. Stress
5. Underlying health conditions like vitiligo
Since you also had grey hair during your teenage years, it can be one of the reason. Also we will have to rule out other causes. There are certain topical lotions which can be started.
Next Steps
Kindly take a consultation either online or offline in Artemis hospital , gurgaon for further management.