Men usually marry women younger then themselves; that is why it seems wives outlive husbands.
Single women/single men are the stats that effect these statistics the most.
Single men never married reflects the higher death rate for men due to two factors: work and recreation related deaths, and the risky lifestyles of homosexuals. Women do not usually perform heavy construction, combat, or engage in risky adrenaline-driven sports activities.
There exists a high suicide and homocide rate among homosexuals, as well as a well known occurrence of diseases particular to anal sexual activities.
Single women never married exhibit little in the way of risky behavior, whether it be in reacreation or sexual lifstyles. Most have jobs that do not involve physical risk.
Keep in mind that this involves large groups over a long period of time. There will be individual exceptions to the above familiar to each of us.