The Selecao lost 2-1 to Uruguay in the last 16, with Ronaldo successfully nullified by both Diego Godin and Jose Luis Gimenez.
Ronaldo is 33, and many have suggested that this may have been his final shot at World Cup glory, though Silva believes he is actually improving with age.
"Ronaldo has had another amazing season," he told reporters, per the Daily Mail .
"He's been the highest scorer in the Champions League and won a third Champions League in a row.
"It's his decision. As a team-mate, I hope so because he helps us so much. He's a fantastic player. We don't need to describe him. So hopefully he stays but it's his decision.
"In this World Cup, he helped us so much, scoring four goals.
"So, yes, it seems like he's getting better with age. I hope he stays but we'll see what happens."