SINGAPORE (Kyodo) Singapore Prime Minister Lee Hsien Loong has cited the failure of the Liberal Democratic Party to renew itself as a grim reminder of the need for his People's Action Party, which has ruled the wealthy city-state for decades, to avoid the same downhill path.

"It is not easy for a party in power to celebrate 50 years in government. You look at the parties in Asia — several of them have been in power for a considerable time, but all of them are soul-searching, thinking (about) what must they change, how must they adapt to the future," Lee said at the party's convention Sunday, the English-language Straits Times newspaper reported Monday.

Lee is secretary general of the PAP, which has been in power since 1959.