Is there any types of credit available for supporting my mom and dad (married) who live with me?

My mom and dad, who are married, live with me in my home and I pay for all their expenses such as medical expenses, food, transportation etc. They are under 65 years old (not receiving pension yet) and they didn't have any income in 2017. Is there anyway for me to claim both my mom and dad as dependent? Or if this is not possible, is there any other types of credit available to me since I am paying for their expenses? 

Thanks for the advice help in advance.