Historic American Buildings Survey, Creator, and John Magruder. Dunblane, Westphalia Road, Forestville, Prince George's County, MD. Forestville Maryland Prince George's County, 1933. Documentation Compiled After. Photograph. Retrieved from the Library of Congress, https://www.loc.gov/item/md0522/.
If you are 65 or older, your gross income needs to be $13,950 or more for you to file. If you are a widow/widower with dependent children you would qualify to file taxes if you are younger than 65 with a gross income of $15,700 or more.
Qualifying widows and widowers have to file when gross income tops $16,750 or $18,000 at 65. If you worked and had taxes withheld from your pay, you'll likely want to file even if you didn't make enough to make it mandatory. This is because you may be due a refund of the income taxes you've paid.