Hello,
Your code is correct except for one minor condition. As seen in table 2.14, those who responded "don't know" for their age are included in the denominator. So the following code will give you the 33,155 total. You just needed to remove hv105<98 .

tab hdis2 if hv105>4 & hv103==1 [iw= hv005/1000000]

Thank you.

Best,
Shireen Assaf