At age 127, Leandra Becerra Lumbreras, a Mexican woman, is thought to be the oldest person alive.

She celebrated her most recent birthday Sunday, but there is no proof of whether or not her birth year, 1887, is correct, according to the Huffington Post.

According to the Telegraph, she lost her birth certificate 40 years ago.

But the woman's age is a realization of her fighting spirit, which first got attention during the 1910 Mexican Revolution, according to the International Business Times. She led a group of women soldiers, called Las Adelitas, who contributed to the war alongside men.

But she has had a full life since then, and attributes her long life to her lifestyle. She snacks in between meals on chocolate, exercises, sleeps full days and was never married, according to IB Times.

In addition, up until about two years ago, she would sew to keep herself entertained, a granddaughter told El Horizonte, the Huffington Post reported.

But the great-great grandmother still has time to entertain her family and enjoys doing so, a talent attributed to having parents who were singers, according to the Huffington Post. She is now deaf and suffering from cataracts, but she entertains her family by telling them stories from her lifetime, which are essentially all in history books, the Daily Mail reported.

In old photos, she is seen always with her hair in a braid and wearing a shawl, long skirts and sandals, El Horizonte reported. She also has some personal items -- also worthy of history books or museums -- including a silver spoon from 1847, old bank notes, gold earrings, a ring and a pocket watch.

She is now confined to a wheelchair and is unable to eat most solid foods, on doctor's orders, according to El Horizonte.

Metro reported that in her long life, she has outlived five children and several of her 20 grandchildren, but she still has 73 great-grandchildren and 55 great-great-grandchildren.

Authorities in Mexico are trying to provide her with a new birth certificate, Metro reported. As a result, the 127-year-old is unlikely to make it into the Guiness Book of World Records, the Telegraph reported.