In 2024, TxDOT will be rolling out FPS23 in which TxME will be added so that Districts can compare long-term performance with the Mechanistic-Empirical (ME) design process. In ME design, the aging of asphalt mixes has a significant impact on long-term pavement performance. Currently, mix aging is considered within TxME using representative aging material properties and field calibration, which is working well for traditional asphalt mixes in Texas. However, new mixes recently developed, such as highly modified asphalt mixes being employed to improve mixture performance in some Districts, tend to age much faster than traditional mixes. Thus, there is an urgent need to enhance the mix aging model and ensure the long-term resilience of asphalt pavement with both traditional and new asphalt mixes. This aging model is to improve the TxME pavement check that will be utilized in the upcoming version of FPS23. Also, TxME was calibrated using statewide pavement performance data; however, Districts want to reevaluate calibration with their own high-quality materials and traffic data and compare long-term performance to FPS pavement designs in TxME pavement check. To achieve the successful calibration and long-term performance prediction of each district, a district-level calibration guidance should be developed and provided to the engineers in Districts. To achieve the objective of this study, the Performing Agency shall (a) review protocols that accelerate laboratory mix aging process, (b) evaluate test methods that are more accessible to Districts, (c) develop a mix aging model, (d) identify key parameters to streamline input into TxME, (e) conduct comparisons between FPS and TxME designs, and (f) support Districts by providing calibration methods, factors, or means for straightforward determination of parameters representative of local materials, mix designs and traffic conditions.