If you receive or pay maintenance, child support or maintenance, you can ask how these items affect your income. However, if you do not plan to use that income to apply for the loan for which you pay back, you do not have to put it on your application list.
Creditors may ask how old you are, to be sure, you have to be adults, reached to close contracts. You may also consider to estimate your age, how long will you continue to work. However, age can not be used to refuse to credit it exceeds 62 or older (in the case of credit scoring systems) or the applicant, whose age is that credit insurance.