iAfrica Image: Pexels Share with your network! However, under certain conditions. Individuals between the ages of 18 and 59 years can use the vaccine. There are two doses that are administered 14 to 28 days apart. One of the conditions is that Sinovac must submit the final results of ongoing clinical studies. It also needs to submit periodic safety updates. The Sinovac vaccine has a provisional shelf life of 24 months.