DNA methylation test
myDNAge has a $299 urine or blood test for DNA methylation, they're running a buy get one 50% off at the moment. Steve Perry recommends this company, I ordered a test and will let you know how it goes. I'm using the spread sheet that JGC created on this excellent thread for comparison. I'm expecting they should agree +- 3 years, if not I'd suspect the Levine paper results.