Date older than 3 years? (yes/no)

Dear Wizards

I am in a need to verify many different dates related to three different items. I need to know whether the dates in column A reltad to a "type" in column B is older than 3 years (column C) and older than 4 years (column D). Sure it is a simple task, I just cant get my head around it

See attached example.

Thank you in advance.