premise: Valentin Vitalyevich Lebedev (Russian: Валентин Витальевич Лебедев ; born April 14, 1942 in Moscow) was a Soviet cosmonaut who made two flights into space. His stay aboard the Space Station Salyut 7 with Anatoly Berezovoy in 1982, which lasted 211 days, was recorded in the Guinness Book of Records.
hypothesis: Valentin Vitalyevich Lebedev was born more than 1000 days ago.
reason: 1000 days is less than 3 years and he was born over 70 years ago. It's difficult because I used days as the measurement.