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How soon before I turn 65 can I apply for SSI?

Approximately 33.6% of all Supplemental Security Income (SSI) recipients in 2025 were aged 65 or older. If your eligibility is based on turning 65, the best time to start the process is not necessarily on your birthday; you can and should establish an intent to file with the Social Security Administration (SSA) earlier. This guide explains how soon before I turn 65 can I apply for SSI and what steps to take for a smooth transition.