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We report the discovery of the oldest (~55 Myr) mid-M type star known to hoston-going accretion. 2MASS J15460752-6258042 (2M1546, spectral type M5, 59.2 pc)shows spectroscopic signs of accretion such as strong Ha, He I, and [O I]emission lines, from which we estimate an accretion rate of ~10^-10 Msun/yr.Considering the clearly detected infrared excess in all WISE bands, the shapeof its spectral energy distribution and its age, we believe the star issurrounded by a transitional disc, clearly with some gas still present at innerradii. The position and kinematics of the star from Gaia DR2 and our own radialvelocity measurements suggest membership in the nearby ~55 Myr-old Argus movinggroup. At only 59pc from Earth, 2M1546 is one of the nearest accreting mid-Mdwarfs, making it an ideal target for studying the upper limit on the lifetimesof gas-rich discs around low mass stars.

2MASS J15460752-6258042: a mid-M dwarf hosting a prolonged accretion disc