@shepunch Again---age is not a factor--at all. But I wonder if you are actually just confused about whether the income you are receiving is "hobby" income or if it is self-employment income. That is what you must determine in order to see if you should be preparing a Schedule C for business expenses and if you should be paying self-employment tax for the income you receive from your craft sales.
See this related post:
https://ttlc.intuit.com/community/taxes/discussion/how-or-where-do-i-report-hobby-income-400-in-the-...
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