SRW DNA age Test - 1 TestDNAage is a saliva test that uses epigenetics to reveal the acting age of your cells your biological age. There is DNA in your saliva from the cells in your mouth. We extract your DNA and process it to measure DNA methylation, which provides an indication of your biological age. Why does biological age matter? What if you could observe the impact your lifestyle choices are having on your body? Your biological age gives you an indication of this,