Hi!

As you refer to cognitive science, maybe you would like to look into studies examining changes in cognitive empathy (perspective taking) and prosocial begavior. Also it may depend from the type of prosocial behavior (instrumental helping, sharing or comforting).

For an idea, here is a study investigating age differences (young and older adults) in empathy and prosocial behavior in an economic game: Beadle, J. N., Sheehan, A. H., Dahlben, B., & Gutchess, A. H. (2015). Aging, empathy, and prosociality. The Journals Of Gerontology: Series B: Psychological Sciences And Social Sciences, 70B, 215-224.

Regards,

Magdalini

Thanks Magdalini :) highly appreciated. :) 

I have in Research Gate two articles related to children's prosocial behavior. The papers are the following. (1) From cost-perception to gain-construction: Toward a Piagetian explanation of the development of altruism in children (published in International Journal of Behavioral Development, 1990, 13 (1) 119-132); (2) toward a Piagetian explanation of the development of prosocial behaviour in children: The force of negation (published in British Journal of Developmental Psychology, 1993, 11, 91-106.  At least, in those papers who will find many references having to do with age and prosocial behavior.

Nancy Eisenberg, Martin Hoffman, Gustavo Carlo are only three authors who deal with your question, By reading them, you can learn a lot about your question. 

Thanks Orlando for kind mail with details. However, My study is on elderly people. I am getting confused how to assess emotional empathy as well as prosocial preferences at same settings. :(