  Stellar evolution models are a cornerstone of young star astrophysics, which
necessitates that they yield accurate and reliable predictions of stellar
properties. Here, I review the current performance of stellar evolution models
against young astrophysical benchmarks and highlight recent progress
incorporating non-standard physics, such as magnetic field and starspots, to
explain observed deficiencies. While addition of these physical processes leads
to improved agreement between models and observations, there are several
fundamental limitations in our understanding about how these physical processes
operate. These limitations inhibit our ability to form a coherent picture of
the essential physics needed to accurately compute young stellar models, but
provide rich avenues for further exploration.
