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Yes, in general, people age 65 or older who are not entitled to premium-free Medicare can purchase health insurance coverage in the Marketplace (except undocumented immigrants). If you sign up for a Marketplace plan, you will be eligible for premium tax credits to make the coverage in the Marketplace more affordable if your income is at least 100% of the federal poverty level (for buying Marketplace coverage in 2025, that means an income of $15,060 for an individual).
Keep in mind that if you are able to continue working, you may be able to earn enough work history to qualify for premium-free Medicare in the future. So another option for you to consider would be to sign up for Part A and Part B coverage when you turn 65 (you will have to pay a premium for both Part A and for Part B), and when you become eligible for premium-free Part A through your work history, you will then only have to pay a premium for Part B.
Browse more questions in the Marketplace Eligibility section.