The requirement to file a tax return is not tied to age.
If you received a 1099-MISC with income designated in Bix #7, the IRS considers you to be self employed
If you earned more than $400 net income (income less expenses) working as a self-employed individual (or 1099 independent contractor), you must file a Schedule C, business income and expenses with your personal return and pay self-employment tax of 15.3%.
If you otherwise earned enough to file a return, you must report your self-employment/1099 income, no matter how small.
See Do I Need to File a Tax Return?
Maybe. It depends on the amount of income you receive. If you only receive Social Security income you are not required to file a tax return.
If you have other income and the other income is less than $12,200 if you are Single you are not required to file a tax return for the Federal. States have different rules.
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