Basically the rules are the same for everyone including dependents.
If you are required to file and you do not then you can be penalized if you owe. However the if the IRS computes your return because you did not and you are due a refund they will simply keep the money. It is your responsibility to file a return asking for a refund of the excess taxes paid in ... and you only have 3 years to do so. After that the IRS gets to keep the money.
So it is in your best interest to at least complete a return to see if you have a refund coming back to you. Use one of the IRS FREE FILE options : https://www.irs.gov/filing/free-file-do-your-federal-taxes-for-free
