A new program to boost the number of women in corporate boardrooms is tapping 100 executives from top businesses in New York to mentor young women.

The effort to increase the number of high-level female executives will be announced Monday at a New York City event hosted by Sen. Kirsten Gillibrand. Executives from IBM, Citigroup, Time-Warner and Macy’s will volunteer for the program, which will start next month and will be open to women who are between two and seven years out of college.

Partnership for New York City chief executive officer Kathryn Wylde, who will take part in the announcement, said that though there are many women in business, they don’t have the same professional networks that help young male executives on the rise.

“They don’t have a well-defined “old girls’ network,'” Wylde said with a laugh. “… The boys are on the golf course and the women are often either at their desk or taking care of family responsibilities. The women don’t have the same kind of professional network and support system.”

Wylde said the Partnership is involving both female and male mentors, in part because of necessity.