Voyager 1 is a space probe launched by NASA on September 5, 1977. Part of the Voyager program to study the outer Solar System, Voyager 1 launched 16 days after its twin, Voyager 2. Having operated for 38 years, 8 months and 15 days, the spacecraft still communicates with the Deep Space Network to receive routine commands and return data. At a distance of 135 AU (2.02×1010 km) as of May 2016, it is the farthest spacecraft from Earth and the only one in interstellar space.

After completing its primary mission with the flyby of Saturn on November 20, 1980, Voyager 1 began an extended mission to explore the regions and boundaries of the outer heliosphere. On August 25, 2012, Voyager 1 crossed the heliopause to become the first spacecraft to enter interstellar space and study the interstellar medium. Voyager 1's extended mission is expected to continue until around 2025, when its radioisotope thermoelectric generators will no longer supply enough electric power to operate any of its scientific instruments.

September 5, 1977 - August 25, 2012= 34 years 11 months and 20 days

More Info: en.wikipedia.org