According to growth rings of this a-tropical species, the oldest ones found at NE-Greenland, reached 126 years.
in ....
Sejr M.K, Sand M.K, Jensen K.T., Petersen J.K., Christensen P.B. & Rysgaard S.; 2002; Growth and production of Hiatella arctica (Bivalvia) in a high-Arctic fjord (Young Sound, Northeast Greenland); Marine Ecology ProgressSeries 244, 163-169;