This is a rejuvenating technique without using single herb, mentioned in charak samhita.
Take proper diet according to Ayurveda ,seasinal regimen, daily regimen etc.
Take proper sleep, no night awakening and day sleeping.
Follow brahmcharya,means to protect oneself,to care for our body and avoid polygamy.[to prevent STD]
Help others,be kind,don,t be egoistic.
Donate if you have in excess.
Respect your elders.
By following these advices you are taking rasayan without consuming it.
And if you are taking some rasayan its effect will increase to manifold.