23andMe is able to trace your ancestry based on these mutations because they occurred in distinct geographical locations during specific periods of time. Assuming 25 years per generation you can expect 150-200 years of DNA information by taking an autosomal DNA test. Calling Hogwash On 23andme S Ancestry Timeline Dnaexplained Genetic Genealogy DNA relative matching just looks for matching segments of DNA submitted. How far back does 23andme go . However haplogroups go back very far at least 10000 years and as much as 75000 years. The Ancestry Composition report estimates what percent of your DNA comes from each of 45 populations worldwide reaching back about 500 years. I didnt tell my mom I was doing the test as her and I have a strained. Population geneticists have estimated that the number of years on average between the birth of an individual and their childs birth is about 29 to 30 years. This estimate seems to be accurate even going back in time hundreds or thousands ...