<prompt> In the calculation of Years of Potential Life Lost YPLL, the denominator is-Population under 75 years of ageMidyear populationPopulation in the ages of 15 to 65 yearsPopulation above 15 years of age  <response>: Years of potential life lost YPLLPotential years of life lost PYLL An estimate of the average years a person would have lived if he or she had not died prematurely. It is a measure of premature moalitydeath. Deaths occurring in individuals age 75 or older are NOT included in the calculation. For YPLL calculation, Numerator is years of potential life lost. denominator is the population under 75 years of age. - It is based on the years of life lost through premature death. 