I should first note that Carolyn Leigh, though little known, especially for a Broadway lyricist (in large part because she passed away too early), is in the Songwriters Hall of Fame. And in addition to writing for Broadway, she also wrote some popular songs, including a couple of huge hits for Frank Sinatra, "The Best is Yet to Come" and the even better, "Young at Heart."
The show starred Anthony Roberts, who later came to much more attention starring in a bunch of Woody Allen movies (and going by Tony Roberts at that point). The story dealt with a down-on-his-luck shlub who figures out a way to become a successful stockbrocker charming middle-aged ladies and gets some unexpected, somewhat devious help from his girlfriend, played by Marlyn Mason, who works for the Stock Exchange. The satire was written by famed comic novelist Max Schulman.
The fun score also had one really big hit, a big production number helped by one of the more unlikely Broadway chorus lines you'll see. This is Tony Roberts and chorus, at the 1968 Tony Awards, telling you that he's finally become a winner, so get out of his way and "Step to the Rear."