If a person reaches age 62 in 2015, for example, then 2015 is the person's year of eligibility. We always index an individual's earnings to the average wage level two years prior to the year of first eligibility.
rill - a small channel (as one formed by soil erosion) channel - a deep and relatively narrow body of water (as in a river or a harbor or a strait linking two larger bodies) that allows the best passage for vessels; the ship went aground in the channel.
weir. n. 1. (Civil Engineering) a low dam that is built across a river to raise the water level, divert the water, or control its flow. 2. (Angling) a series of traps or enclosures placed in a stream to catch fish. [Old English wer; related to Old Norse ver, Old Frisian were, German Wehr ].