Included in the airport section of AF website, you will find a text concerning paying people that must (Afaik) be valid for Silver Elite:


Flying Blue Gold and Platinum or SkyTeam Elite Plus
You and a guest of your choice can take advantage of the 530 Air France and SkyTeam lounges.

You have access to the lounges when you travel:
on an AIR FRANCE, KLM, or SkyTeam international flight,
on an AIR FRANCE flight within France that departs from Paris-Charles de Gaulle,
on a KLM flight within the Netherlands that departs from Amsterdam-Schiphol,
on a SkyTeam flight within one country that connects to a SkyTeam international flight on the same day,
upon arrival on a SkyTeam international flight to Paris-Charles de Gaulle terminal 2C,
upon arrival on a SkyTeam international flight, for the KLM Crown
Lounges located in Amsterdam-Schiphol, Dubai, Glasgow, Houston, Johannesburg, and Toronto.

Please note: Flying Blue Gold members who reside in the United States or Mexico have access to AIR FRANCE and KLM lounges, but do not have access to SkyTeam lounges.

In certain international airports*, you can invite guests. For these extra guests (beyond the 1st guest), there is an entrance fee that varies by country:
25 and 35€ in Europe, Asia, Pacific, the Middle East, Africa,
35 and 50 USD in the United States and Latin America,
30 and 50 CAD in Canada,
or 2,500 and 5,000 Miles depending on the zone.
You can pay directly at our lounges by credit card or by using your Miles.
* As long as space is available and if the guests travel with AIR FRANCE, KLM, or a SkyTeam partner. These lounges are common to AIR FRANCE, KLM, and Delta. The international airport lounges that are open for a fee are:
- Europe: Amsterdam, Berlin, Dusseldorf, Frankfurt, Lisbon, Manchester, Milan, Paris-Charles de Gaulle (except La Première lounge and Terminal 2G lounge), Stuttgart and Zurich.
- North America (AIR FRANCE/KLM/Delta airport lounges): Boston, Chicago, Houston, Los Angeles, Montreal, New York-JFK, San Francisco, Toronto, Washington, Atlanta, Cincinnati, Tampa, Dallas, Raleigh, New Orleans, Jacksonville, Seattle, Fort Lauderdale, Minneapolis, Portland, Detroit, West Palm Beach, Memphis, Milwaukee, Boston and New York-La Guardia.
- South America (Air France): Rio de Janeiro and Sao Paulo.
- Asia-Pacific (Air France/Delta): Tokyo and Honolulu.
- Africa (Air France): Douala and Johannesburg.
- Middle East (AIR FRANCE/KLM airport lounges): Dubai.