Researchers built an AI speech clock that estimates biological age from voice. It uses pitch, talking speed and hundreds of other vocal features. The tool calculates a speech age gap between predicted and actual age. Large gaps link strongly to cognitive issues like dementia. It needs only four minutes of recorded speech. The study used 2,928 Spanish speakers from five Latin American countries. The model distinguished healthy people from those with cognitive impairment. Findings were published in Science Advances.

• 2,928 Spanish speakers recorded
• 700+ speech characteristics analyzed
• 4 minutes of speech recordings used