Never mind that more and more employees are delaying retirement – the majority of employers are still concerned about losing experienced workers. A recent study by MetLife found nearly three-quarters of employers said their experienced workers' impending exodus was their biggest worry, compared with only 26 percent who said the impact of delayed retirements weighed heavily on their minds.

Furthermore, employers are not optimistic about the future. Over two-thirds of employers said they believe that in three to five years employees will wait even longer to retire than today's employees. Yet, 70 percent are still concerned about a knowledge drain and only 30 percent are concerned about the effects of delayed retirements. From the survey:

"This singular focus on the knowledge drain may be attributed to plan sponsors' strong feelings of anticipatory anxiety: a lack of preparation for the retirement of older workers and fear of the unknown (i.e., when employees will retire, how many will retire in a given year, what the impact will be to their organization's productivity, culture and bottom line)."