Research indicates that the best estimate of your age is from research indicates that the best estimate of your age is from markers in your cells the number of days you've lived your body mass index (bmi) the number of minutes you exercise every week submitmy answersgive up part b the cells examined from the 2,400 people in this study were from the cells examined from the 2,400 people in this study were from hair surgically removed tissue skin scrapings bloodresearch indicates that the best estimate of your age is from research indicates that the best estimate of your age is from markers in your cells the number of days you've lived your body mass index (bmi) the number of minutes you exercise every week submitmy answersgive up part b the cells examined from the 2,400 people in this study were from the cells examined from the 2,400 people in this study were from hair surgically removed tissue skin scrapings blood