Chelsea defender Ivanovic feels capable of more improvement
The Serb is pleased with his personal form this season.
"After 20, I stopped counting - is it really 28 now?" he said.
"Maybe the statistics say it's the best time for a footballer - you're still young, but you also have experience. But I think every player can always improve - his age doesn't mean a lot.
"I will just try to do the same things and keep pushing myself."