How to get data from database up to 5 years old on SqlServer?

Question

SQL Server

How can I get data from a database up to 5 years old on SqlServer? Tried like this:

DATEDIFF(YEAR, BirthDay, GETDATE()) <= 5
   --(GETDATE() - BirthDay_BirthDay) <= 5
  --BirthDay > DATEADD(YEAR,-5,GETDATE())
  --(YEAR(GETDATE())-YEAR(BirthDay)<=5)

but it doesn't work

Answer 1

and so?
DATEDIFF("yyyy", BirthDay, GETDATE()) <= 5
It would also be nice to make sure that BirthDay and GETDATE() are of the exact data type that you want to pass to the DATEDIFF input.
proof