Economists studying the eldery and intergenerational transfers Does anyone knows who are the leading economists in the field of elderly and intergenerational transfers?

I'd like to know what are the current topics they are working on.
As far as intergenerational transfers are concerned, I would suggest you start with Wojciech Kopczuk:

Kopczuk, Wojciech. "Taxation of Intergenerational Transfers and Wealth." Handbook of Public Economics 5 (2013): 329.