We just had a "since forever" thread (http://forum.wordreference.com/showthread.php?t=585505), where native speakers more or less agreed that the expression sounds child-like So from this it would follow that "since always" would sound child-like too, right? But I have the following dialogue: Laura: "On whose orders (did you follow me)? Who is your master?" "Your orders," Tomas said. "You are." "Me?" Laura gave a nervous laugh. "Since when?" "Since always," Tomas replied. (Obviously, Laura doesn't remember that time when she gave the order. It's very long ago.) That doesn't sound child-like, does it?