Young Malaysians will not forget that the Perikatan Nasional government breached its promise by delaying the registration of those aged 18 years as voters, Najib Abdul Razak said.

Taking to Facebook, the former prime minister said he somehow expected this as the youngsters were angry with the ruling coalition.

"I am disappointed that the promises given in the Parliament are not kept because it is not logical for the government to take three years to implement the Undi18.

"I believe that the young people will not easily forget this breach of promise," Najib said in his Facebook yesterday.

"I had expected that the PN government was less willing to implement this, as I have written earlier this month," he said.