You answered this question with some helpful information but after reading what u put would the answer be how personality develops across the lifespan then?

Developmental psychologists study all of the following EXCEPT:

-What part of the brain is involved in the development of depression
- Smoking trends of adolescents
- Prenatal development
- Aging issues of the elderly
- How personality develops across the lifespan

3 answers

Please go back and read Bob's answer again. He gave you such a big hint that it should be hitting you in the face.
I had a typo, I will correct it..

<smoking in teens is a development issue, they study that. What development psychologist studies brains...the realm of neurosugerons?>
Since the neurological aspects of depression are not related to any particular portion of the lifespan, this would be more in the realm of physiological psychology or clinical rather than developmental.

I hope this helps a little more. Thanks for asking.