I am 65 yrs old, and I was paid $9,100 from babysitting, do I need to file taxes?

[DoninGA]

Assuming that you were not a household employee who receives a W-2, then you income is from self-employment and you are required to report the SE income on a federal tax return if the amount earned is $400 or more.  You will also have to pay self-employment taxes on the Net SE income you report.  The SE taxes are 15.3% of your net and include both the employer and employee portions of Social Security and Medicate taxes.

See this TurboTax support FAQ for entering SE income  - https://ttlc.intuit.com/turbotax-support/en-us/help-article/self-employment-taxes/report-income-self...