What grow(s) and what decline(s) in middle adulthood? Scientifically describe the developmental stage of ‘Middle adulthood,' using the framework of ‘Development is multidimensional' and ‘Development is multidirectional.' (Baltes et al., 1989). Make sure to present your conclusion (i.e., not only listing up what grow and what decline, but present your view of middle adulthood with scientific evidence).