We recommend folks wait 4-6 months between using the TruAge COMPLETE kit, to allow time for methylation changes to occur. This is the timeframe most useful to the average person. In the instance of massive lifestyle shifts, we have seen significant changes occur to Biological Age readouts as rapidly as 8 weeks. For TruAge PACE, focusing on the Dunedin Pace of Aging measurement, you can test as often as every 3-4 months to see how your lifestyle is affecting your current rate of aging. How often you decide to test is ultimately up to you.