Final answer:
Recent research by Sutin et al., alongside studies by Kessler et al., Moffitt et al., and others, have found that age, developmental stages, and childhood factors significantly influence vulnerability to depressive symptoms across the lifespan.
Step-by-step explanation:
The study by Sutin et al. that you're referring to, although misdated as in press from 1958, likely discusses the relationship between age and depressive symptoms. Research in the field has shown various findings on how depressive symptoms can manifest and vary across the lifespan. For example, Kessler et al. (2003) found that depressive disorders have a high lifetime prevalence, often beginning in adolescence or early adulthood. Similarly, Moffitt et al. (2007) discussed how childhood risk factors can predict depression into adulthood. Ge et al. (2001) showed the emergence of gender differences in depression during the pubertal transition with additional stressors contributing to depressive symptoms. Nanni et al. (2012) outlined how childhood maltreatment is a predictor of a more challenging course and treatment outcome in depression.
These findings collectively suggest that age and developmental stages, alongside environmental factors, contribute significantly to the vulnerability to and manifestation of depressive symptoms. While age itself is not the only determinant, understanding how depressive symptoms evolve and how they are influenced over the course of one's life can help in formulating better prevention and intervention strategies.