How old is Ayurveda?

How old is Ayurveda? As Ayurveda means the science of life, we can say it began when our ancients needed something to cure diseases. Age of Ayurveda cannot be measured in accurate number because it is a legacy of knowledge which is having roots from Pre-Vedic Period. Classical Ayurveda texts are supposed to be the result of the transmission of medical knowledge from the Gods to sages and then to human physicians. This transfer of knowledge from sages to human physicians can be lined as below A. Brihat trayi [Main trilogy for transfer of Ayurveda Knowledge] - Charak Samhita, Sushrut Samhita, Ashtang Hridayam B. Laghoo trayi [Trilogy of supportive books for transfer of Ayurveda Knowledge] - Madhavanidan, Sharangdhara Samhita, Bhavaprakasha Nighantoo A] Ancient period Before 2500 BCE - This knowledge in beginning was transferred ...