HHINCOME - how to determine age cut off for sample?

I am trying to create a sample that only includes individuals who might have contributed to the household income. The variable says that income questions are asked of people ages 15 and over. If I am using the March 2014 sample, should I include all individuals who are 15 and over at the time of the survey? I am not sure how the questions about income are asked, so I wanted to double check.

HHINCOME records the total income of all household members age 15 and over. Any household members under the age of 15, even if they happened to earn income, do not contribute to HHINCOME. It is possible to see the exact contributions by each household member by using the INCTOT variable. HHINCOME is simply the sum of all household members’ total personal income (INCTOT).

Hope this helps.