18 Years’ Worth of Days The average retirement lasts for 18 years, with many lasting even longer. Will you fill your post-retirement days with purpose? Related Content Red Flags for Tax Auditors Here are six flags that may make your tax return prime for an IRS audit. Immediate vs. Deferred Annuities Looking forward to retirement? It's critical to understand the difference between immediate and deferred annuities. Risk Perspective Is it possible to avoid loss? Not entirely, but you can attempt to manage risk.