If you were planning to retire next year, double check your math because a law passed in the ’80s is annually raising the age when Americans can collect their full Social Security benefits. And next year is no exception.

Social Security has a big birthday coming up next year -- it's turning 90! It's kept many millions of people out of poverty for decades and was recently supporting more than 71 million people with around $1.5 trillion in benefits for the year.

The Social Security retirement age will increase in 2025, meaning working Americans may have to wait longer before collecting their benefits.

The claiming decision is strongly tied to the age at which someone retires, especially for younger retirement ages.

If you wait to claim spousal benefits until your full retirement age, you can receive up to half the amount of your spouse's benefit.