And Jenkins admits he has no plans to retire from the international scene for as long as his body allows him.
"Obviously, you think that every game you play could be your last," he said. "You need to perform and you need to be at that top level.
"I think that the game has got more and more physical and more and more endurance-based. Touch wood, I haven't had any recurrences of my calf injuries this season.
"You can't beat playing for your country, and I cherish every moment. I am working hard to keep going as long as I can. Everyone knows that teams are coming for us. Teams are going to be looking to knock us off our perch.
"Ireland are going to be fired up, and we have got to match that and show how good we are, really. It comes with our success over the last two years.
"That is the pressure we put on ourselves to win the title, so I suppose the same is the case this year. We have put the pressure on ourselves.
"It's different to the first five or so years when I was first involved [with Wales]. You always felt you had a chance going into a game, but you've got belief. It's a big change in mentality."