Yes, all income, no matter the age is taxable unless specifically stated in tax law. An example would be that not all of your social security income can be taxed because it is maxed at 85% based on calculations that include all other taxable income.
It's quite likely you do owe the tax since you had this other job. The confusion for many, not just yourself, is the social security factor. Once you reach full retirement age, then you can earn as much money as you want without losing or repaying any social security benefits back to them.
The tax law is completely separate and we must file if we have income and meet the filing requirements.
@genek12
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