1. A computer implemented method to predict starter control valve failures in gas turbine engines using a starter control valve health prognostic, the method comprising the steps of: extracting one or more health index features from operational gas turbine engine startup data received for one or more gas turbine engine startups of one or more gas turbine engines of a certain gas turbine engine model; calculating a starter control valve health index for each of the one or more gas turbine engine startups responsive to the one or more health index features extracted from the operational gas turbine engine startup data to thereby define one or more health indices; comparing each of the one or more health indices to a starter control valve health prognostic for the certain gas turbine engine model; and determining, responsive to the step of comparing, a potential predictive starter control valve failure point, the potential predictive starter control valve failure point being located where one of the one or more health indices correlates to the starter control valve health prognostic for the certain gas turbine engine model.