Japanese citizen, Misao Okawa, celebrated her 117th birthday in a nursing home in western Japan on Wednesday. Oddly enough, she told a government official that her life "seemed rather short."

Okawa was born on March 5, 1898, in Osaka. She was officially recognized as the oldest person in the world by Guinness World Records in 2013.

Okawa is still eating well but does have some hearing issues. According to her nursing home staff, she has "slowed down in recent months." Okawa married her husband, Yukio Okawa, in 1919 but he died in 1931. Okawa did not remarry but does have four grandchildren and six great-grandchildren, according to the Associated Press.

What is the secret to such a long life? Okawa isn't quite sure: "I wonder about that too."

Four other worldwide citizens lived longer than Okawa has thus far.

(4) Canadian citizen, Marie-Louise Meilleur (female), lived until she was 117 years, 230 days old.

(3) United States citizen, Lucy Hannah (female), lived until she was 117 years, 248 days old.

(2) United States citizen, Sarah Knauss (female), lived until she was 119 years, 97 days old.

(1) The oldest (verified) living person on record was French citizen, Jeanne Calment (female) whom lived until she was 122 years, 164 days old.

Interestingly, only two males rank amongst the 15 (verified) oldest living people on record. The man to live the longest on record was Japanese citizen, Jiroemon Kimura (116 years, 54 days).