A staple of UK primary school assemblies, the "Spring Chicken" song (also known as "One Mother Hen") is a modern classic often remembered with nostalgia.

: This common negative expression describes someone who is no longer young, or perhaps trying to act younger than they are.

: In the early 1700s, farmers found that chickens born in the spring were more tender and fetched better prices than those that had survived the winter. Buyers who spotted older birds being sold as new ones would complain they were "no spring chicken". 2. The "Spring Chicken" Song

In the kitchen, a spring chicken is a young bird, typically less than 28 days old and weighing between 750 and 850 grams.

What is the origin of the phrase 'you're no spring chicken'? - Facebook