If you are 66, retired collecting a pension and social security, can you contribute to an IRA?

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To contribute to a an IRA, one must have earned income, such as wages, salaries, commissions, tips, bonuses, or net income from self-employment. Taxable alimony and separate maintenance payments received by an individual are treated as compensation for IRA purposes.

Earned income does not include earnings and profits from property, such as rental income, interest and dividend income, or any amount received as pension or annuity income, or as deferred compensation.

See https://www.irs.gov/taxtopics/tc451.html