Employers offer many types of retirement benefits. I will assume you are referring to your pension retirement benefit which may provide you a monthly income payment for life or the option of a one -time lump sum. Regarding the monthly income payment for life employers sometime offer a choice of payment terms. For example, you may be able to choose from a single life payment or a lower joint life payment. The single life payment would end at your death while the joint life payment would continue to your spouse if you predecease her. The joint life payment will be lower than the single life payment because there is a reasonable chance your spouse will outlive you and require the employer to make payments for a longer period of time. Joint life options can range from where your spouse continues to receive the same payment amount you had received to only 50% of your amount. This decision is important because once it is made you normally cannot change it.
Your first step is to contact your employer and ask for more information regarding your options. Your employer should be able to tell you what you can expect to receive per month under the various options they offer with some accuracy if you are approaching retirement.