T2s are typically insulin resistant by definition. T1s may or may not be. If there are rare T2s who are found not to be insulin resistant they may be undiscovered MODY or T1. T2s are typically insulin resistant for years to decades but the pancreas is able to keep up. Only when the pancreas begins to fall behind do major symptoms arise. According to a recent study normal weight teenage offspring of T2 parents were found to be insulin resistant despite normal bgs and a lack of symptoms. It is entirely possible we are born this way. Until someone tests normal weight infant offspring of T2 parents we won't know for sure but thus far nothing contradicts the probability.