Maggie Poston started the morning after her 90th birthday the same way she has nearly every day for the past 45 years: helping students at P.S. Poston started working as a crossing guard at P.S. "We haven't had any students hit by a car with Maggie here, because she makes sure that everyone stops," says Katerina Sidbury, P.S. The only time Poston says she's been late was on Jan. 29, the morning after her 90th birthday. She told her friends she was looking for a part-time job with a short commute, and one of them told her about the open crossing guard job.

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Persons: Maggie Poston, Poston, Maggie, Katerina Sidbury, Ida Ripo Ramos, she's, Ripo Ramos, She's Locations: P.S, Brooklyn, N.Y, Lincoln