LOS ANGELES (AFP) - The worlds oldest person celebrated her 115th birthday here Monday with music, cake and a letter of congratulation from US President Barack Obama. Gertrude Baines, who became the planets longest living human in January following the death of Portuguese woman, Maria de Jesus, also 115, marked her birthday at Los Angeles Western Convalescent Hospital. Baines who attributes her longevity to her religion and clean-living attracted worldwide headlines last November when she became the oldest African-American to vote for Obama during the presidential election. She marked her latest milestone on Monday by declaring that she hopes to be around to vote for Obama again in 2012. Mondays low-key ceremony saw a group of friends sing Happy Birthday to Baines before the reading of a proclamation from the Guinness Book of World Records acknowledging her as the worlds oldest person. Her only complaint to me, well there are two complaints, number one, she doesnt like the bacon. Its not crisp enough, her doctor, Charles Witt, told KCAL9 local television. And the other thing is she fusses about her ... arthritis of her knees. She told me that she owes her longevity to the Lord, that she never did drink, she never did smoke and she never did fool around. Born in 1894 in Shellman, Georgia, Baines father was the son of slaves, and Baines has outlived her entire family. Her only daughter died of typhoid fever when she was a toddler. Baines, who worked as a maid in University of Ohio dormitories until her retirement, has lived at the Convalescent Hospital for more than 10 years.