Why is an HSA called the ultimate retirement account?

HSAs offer triple tax benefits: contributions are tax-deductible, growth is tax-free, and withdrawals for qualified medical expenses are tax-free. After age 65, withdrawals for any purpose are taxed like a Traditional IRA (no penalty). The strategy: contribute the max ($4,150 single / $8,300 family for 2024), invest it, pay medical bills out of pocket now, and let the HSA compound for decades.