Defaulting Date of Superannuation in IT0019 & IT0041 while executing Action

Hi Guru's,

I have to default " date of superannuation " which has been created as a Task type & Date Type for IT 0019 & IT0041.

While executing Hiring Action how the system can default the date of superannuation in field - TERMN as + 60 years as calculated from the Date of Birth field - GBDAT of IT0002.

If Dynamic action is the solution ...kindly provide the steps.

Thanks in advance