Retirement isn’t an age. It’s a point at which your finances are where you can permanently leave the workforce. ~ USAToday

Retirement refers to the time when someone permanently leaves the workforce, usually in their later years.

Retirement is often synonymous with the idea of financial independence, which is when your savings and investments are sufficient to cover your living expenses and support you for the rest of your life.

Many Americans think of retirement as a certain age. And certain retirement benefits are indeed associated with a specific age. For example, the minimum age to start collecting Social Security benefits is 62, but you’ll have to be 66 or 67 to collect your full benefits.

However, retirement isn’t an age. It’s a point at which your finances (the magic number) are where you can more than cover your monthly living expenses and permanently leave the workforce.

The “magic number” rule of thumb for retirement is to have 25 times your annual expenses or to spend only 4% of your portfolio per year during retirement.

Source:  https://www.usatoday.com/money/blueprint/retirement/what-is-retirement/