no spring chicken - Phrases/Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
No longer a young person, as in Sally's no spring chicken, but she plays a fine game of tennis. This unflattering expression, often applied to women, has been used since the early 1700s, although spring was omitted from the earliest citation (1711).