The Syphon Filter series has received an age rating

Apparently, before updating Play Station Plus, Sony wanted to set age limits for some games. Age ratings for the Syphon Filter series, which is set to be released for Play Station 4 and Play Station 5, have been found on the South Korean commission's website. 

Syphon Filter 1, 2, 3, Dark Mirror And Logan's Shadow Get Rated In Korea For PS4 And PS5

Syphon Filter Games List: Best to Worst

Try out new combat moves including Blind Fire to send your foes running for the hills Try out new combat moves including Blind Fire to send your foes

Syphon Filter: Logan's Shadow - PlayStation 2

Syphon Filter 2 - Wikipedia

Syphon Filter 3 trophies on PS Plus complete PS1 classic trilogy

Syphon Filter: Dark Mirror - Wikipedia

Syphon Filter 3 (Video Game 2001) - IMDb

Four Classic Syphon Filter Game Ratings Appear Online For PS4 and PS5

Try out new combat moves including Blind Fire to send your foes running for the hills Try out new combat moves including Blind Fire to send your foes

Syphon Filter: Logan's Shadow - PlayStation 2

Syphon Filter 2 (Video Game 2000) - IMDb

Syphon Filter: Logan's Shadow - IGN

Syphon Filter: Dark Mirror for Sony PSP

Syphon Filter: Dark Mirror, Syphon Filter Wiki