Some cicadas have been observed to live more than twenty-two years.
The most well-known cicadas in North America are the Magicicada periodical cicadas, aka “locusts”, which have amazingly long 17 or 13 year lifecycles. Brood VIII (17-year life cycle) will emerge in Ohio and Pennsylvania in 2019. Magicicada have been documented to emerge after 22 years.
That is one long-lived bug.
There is a lot of interesting information at Cicada Mania.