How old are Molly and Lucy Weasley?

While the exact ages of Molly and Lucy Weasley are never explicitly stated in the books, here's what we know:

* Molly Weasley is described as being in her late 40s or early 50s during the events of the Harry Potter series.

* Lucy Weasley is one of Molly's sisters, and she is younger than Molly.

We can infer that Lucy would likely be around the same age range as Molly, perhaps a few years younger.