find age from a numeric and and date values

[Cooksam13]

ok so, I have been working on this for a while, and I just need this last step figured out. 

I want age at the hbv test (hbv2) and I have the date of birth (CDOB). 

I do this code and get this output but obviously that isn't correct so what can I do to fix this

data want;
set have;
ageattest = hbv2 - CDOB;
run;

this is proc contents for the two variables

Variable Type Len Format Informat Label

hbv2

Num

8

YEAR.

CDOB

Num

8

8.

[Reeza · Accepted solution]

data want;
set have;
ageattest = year(hbv2) - CDOB;
run;

Here's a great, but longer and in depth, reference for dates and times in SAS
https://communities.sas.com/t5/SAS-Communities-Library/Working-with-Dates-and-Times-in-SAS-Tutorial/...