Before revision:  Even so, the aging process is complex -- with multiple interacting physiological scales . Computational models that simulate realistic individual trajectories of health during aging, and that include mortality, can significantly advance our understanding of aging  .
After revision:  Even so, the aging process is complex -- with multiple interacting physiological scales . Computational models that simulate realistic individual trajectories of health during aging, and that include mortality, can significantly advance our understanding of aging with the use of computational models that simulate realistic individual trajectories of health as well as mortality .