When you apply for reduced retirement benefits, the Social Security Administration will check to see if you are eligible for both your own retirement benefits and for benefits as a spouse.  If you are eligible for both, the Social Security Administration always pays your own benefits first.  If your benefits as a spouse are higher than your retirement benefits, you will get a combination of benefits equaling the higher spouse benefit.  If you choose to receive a reduced benefit before full retirement age, you are not entitled to the full spouse's benefit rate upon reaching full retirement age. A reduced benefit rate is payable for as long as you remain entitled to spouse's benefits.

Note:  You cannot receive spouse's benefits until your spouse files for retirement.

You can file for retirement benefits online.