Every section above optimizes for the version of you that reads tax tables and runs projections. At some point in late retirement, that version is not the version making the decisions, and the failure mode is not bad market returns. It is the late-life cognitive trajectory—not necessarily dementia, often just garden-variety aging—that leaves the previously disciplined investor vulnerable to scams, poor decisions, and the inability to manage complex affairs. The cruel arithmetic is that the version of you most at risk is the version whose judgment is already impaired and who will not recognize the impairment. The plan must be in place before that recognition is needed.
Establish a financial confidant while you are healthy Pick one trusted person—an adult child, a sibling, a spouse, an attorney with a long relationship, or a professional fiduciary—and start running major financial decisions past them now. The relationship must exist as a working pattern, not just a name on a power of attorney activated for the first time under duress. The confidant should already know your portfolio structure, the location of accounts, the names of your CPA and estate attorney, and your stated preferences.
Formalize the role with durable documentation A handshake is insufficient. The standard architecture includes a durable power of attorney for financial matters, a healthcare directive paired with a healthcare POA, and—for households using a revocable living trust—a successor or co-trustee with explicit incapacity authority. The trust arrangement is usually the cleanest because assets are already titled in the trust and the co-trustee can act without the institutional friction that banks impose on POA holders. Coordinate these choices with your estate attorney (chapter “Estate planning”) to ensure the documents do not deadlock when needed.
Consolidate the attack surface Multiple brokerages, banks, scattered legacy IRAss, and a dozen account logins are a cognitive scaffold that works only as long as you can hold it in your head. Once you cannot, each account is a separate attack vector for fraud and a failure point for your confidant. Consolidate to as few institutions as the asset-protection structure permits—you still want the BAPCPA-trace separation between rolled-over IRAs and active 401(k)s (section “Federal Shields”), and you still want FDIC and SIPC coverage maximized, but fewer institutions and fewer logins is a security improvement. Consolidate while you can still execute it.
Move attack surface into income flow A liquid $3M brokerage portfolio is a $3M attack surface; the same $3M paying out $15,000 per month as a no-cash-value income annuity is a $15,000 attack surface, refreshed monthly. The annuity discussion in section “Annuities” covers longevity-insurance case; the scam-resistance and diminished-judgment case is the parallel argument. Converting a portion of the portfolio—not all of it, but enough to cover baseline expenses—into income-only annuity coverage removes that portion from the set of assets a single bad day or a single bad call can drain. The trade is permanent illiquidity on the converted sleeve. For the bucket meant to fund the rest of your life, illiquidity is the feature, not the bug.
Decide in advance what you will do when decline occurs If you do notice your judgment slipping—through a medical workup, a stretch of decisions a spouse flags as out of character, or simply the slow recognition that complex paperwork is taking longer—the plan you wrote during full capacity is the script you execute. Hand day-to-day management to the co-trustee or POA holder. Stop making unilateral decisions on accounts you have not yet handed over. Bring the financial confidant to your next call with your CPA and estate attorney to update the institutional record. The hardest part is the handover itself. The plan exists so that the present-day version of you, who can still see the trajectory clearly, has already made the decision the future version of you will resist.