Flying Blue, free lounge access even for children of frequent flyers
Starting yesterday, Oct. 12, frequent flyers enrolled in the Flying Blue program will have free access in all [...]

As of yesterday, Oct. 12, frequent flyers enrolled in the Flying Blue program. will have free access in all Air France lounge and KLM with a guest and their children.
In this article:

My daughter in the AF lounge in Paris
The change applies to all Platinum status holders or above and in all company-owned waiting rooms.
There is no limit to the number of children you can bring in addition to the guest, the only limitation is that children must be minors. It may seem strange, but to date many programs count children as adults when it comes to guests in lounges, with this change it will Will avoid the unpleasant situation of not being able to enter the lounge with family, when traveling in Economy, because it is impossible to enter with more than 1 guest.
Recall that FB recently launched the loyalty program dedicated to families and which allows children to earn FB points without expiration until they turn 18. Unlike other programs, Air France's frequent flyer allows children to earn the same levels as adults, levels that expire exactly the same as those of adults.