One way to categorize waves is to say that there are longitudinal and transverse waves. In a transverse wave, particles of the medium are displaced in a direction perpendicular to the direction of energy transport. In a longitudinal wave, particles of the medium are displaced in a direction parallel to energy transport.
Seven plans allowed normal retirement within these ages. Six of them required at least 30 years of service for normal retirement. Only two of the plans continue to allow normal retirement within these ages. Both now require a minimum age of 57 and at least 30 years of service. For most plans the minimum age requirement increased to the range of age 60 to age 62. Age 60.
Under the Traditional Pension Plan, the minimum age and service eligibility requirements for each retirement transition group are as follows: Early Retirement If you choose to retire before reaching age and service eligibility for an unreduced benefit, a reduction determined by your age or service credit will be applied to your benefits. Your benefit will be calculated at the reduced amount for as long as you receive retirement benefits.