Krul has been linked with a January move to Manchester United after having impressed in the Premier League for Newcastle this season.
Krul said in the Daily Mirror: “The manager has always insisted that if you’re good enough, then it doesn’t matter how old you are. I’ve always firmly believed in that myself, and I’m just glad I’ve got my chance.
“Maybe in the past, ‘keepers have traditionally been a lot older, but there are some top young goalkeepers around now and that’s very important.
“I want to stay at this club for a long, long time and, hopefully, because I am still only 23, I can do that.
“I am loving life, and going to places like Old Trafford is special.
“Every game is bringing new challenges for me and it’s up to me to keep rising to those challenges. I’m very pleased with my game at the moment and with the way things are going. To be honest, I couldn’t have wished for better.
“We are answering a lot of questions as a team this season and everyone is playing their part.”
Krul also insists he has set his sights on winning a first-team place for Holland in time for Euro 2012.
Krul said: “To be in the squad for Euro 2012 would be the icing on the cake after what will hopefully be a successful season with Newcastle.
“I can’t rest on my laurels and I can’t allow myself to relax, because I know Steve Harper and Rob Elliot are there to push me.
“I can’t rest easy because I need to be on top of my game week in, week out.”