21+ to buy products should be 18. At some age children become adults.
Study the personal income tax and you will find it is primarily enforced through your employer. If each of us had to save and write a check there would be little compliance.
For non-commercial property, if the property is not cataloged by county assessor, it doesn't get taxed. Dig in on this bit and be amazed.
I and a lot of people do have to save a write a check (I pre-pay estimated actually). You do not want to get on the wrong side of the IRS.
Federal personal income tax does generally apply to federal government employees. When a non-govt employer withholds from your paycheck it does become difficult to then get out of volunteering to pay.
Are you a commercial driver and also federal employee? Or like most people do you shuffle in to the lines to voluntarily contribute?
I am an independent software developer and like most business owners I contribute because it's required by law and failure to do so carries harsh penalties.
Are you telling me that you do not pay federal and or state income taxes? That you do not contribute to FICA? Are you under the impression that because you are not a federal employee that you are not required to pay federal income taxes?
If so, the IRS has plenty to say about it: https://www.irs.gov/privacy-disclosure/the-truth-about-frivo...
This initially takes effort.
Still pay sales tax, use tax, TSA groping tax, etc.