Former premier Dr Mahathir Mohamad is willing to debate with anyone from Prime Minister Najib Abdul Razak's camp.

However, he said Najib and his "lieutenant" Nazri Abdul Aziz, should not be afraid of an old man like himself.

"Come la Nazri and Najib, what's there to fear? I'm an old man. Are you afraid of an old man?" Mahathir asked when met by reporters in Kuala Lumpur today.