The oldest woman alive says she made it to 115 years old — surviving both World Wars and the 1918 flu pandemic — by avoiding 'toxic people'

• Guinness World Records confirmed Spanish resident María Branyas Morera as the world's oldest person.
• Morera said one key to longevity is to stay away from toxic people. 
• Research has indicated toxic relationships can impact mortality and cause health problems.

The world's oldest person's key to a long life is simple: cut out toxic people. 

Guinness World Records confirmed María Branyas Morera, 115, as the world's oldest person on January 19.

Born in San Francisco, Morera moved to Spain when she was eight. She lived through both World Wars and the 1918 flu pandemic before retiring in a nursing home 22 years ago.