Maggie Poston is finally ready to retire — at age 90.
Since 1978, the widowed mother-of-two has been a crossing guard at PS 282 in Park Slope, Brooklyn, at 6th Avenue and Lincoln Place —- which locals often refer to as “Miss Maggie’s corner.”
“She’s always on her post, never sitting,” Poston’s supervisor, School Crossing Coordinator Ida Ripo-Ramos, told The Post.
Poston was 44 when she first started the job. Jimmy Carter was president, Ed Koch was mayor, the Bee Gees were at the top of the charts and “Grease” had just hit theaters.
She had been working a retail job at Montgomery…
