[en] We investigated the absolute age of the Galactic globular cluster M71 (NGC 6838) using optical ground-based images ($u^{\mathrm{\prime <!--\; ???\; -->}},g^{\mathrm{\prime <!--\; ???\; -->}},r^{\mathrm{\prime <!--\; ???\; -->}},i^{\mathrm{\prime <!--\; ???\; -->}},z^{\mathrm{\prime <!--\; ???\; -->}}$) collected with the MegaCam camera at the Canada–France–Hawaii Telescope (CFHT). We performed a robust selection of field and cluster stars by applying a new method based on the 3D ($r^{\mathrm{\prime <!--\; ???\; -->}},u^{\mathrm{\prime <!--\; ???\; -->}}-<!--\; ???\; -->g^{\mathrm{\prime <!--\; ???\; -->}},g^{\mathrm{\prime <!--\; ???\; -->}}-<!--\; ???\; -->r^{\mathrm{\prime <!--\; ???\; -->}}$) color–color–magnitude diagram. A comparison between the color–magnitude diagram (CMD) of the candidate cluster stars and a new set of isochrones at the locus of the main sequence turn-off (MSTO) suggests an absolute age of 12 ± 2 Gyr. The absolute age was also estimated using the difference in magnitude between the MSTO and the so-called main sequence knee, a well-defined bending occurring in the lower main sequence. This feature was originally detected in the near-infrared bands and explained as a consequence of an opacity mechanism (collisionally induced absorption of molecular hydrogen) in the atmosphere of cool low-mass stars. The same feature was also detected in the r′, $u^{\mathrm{\prime <!--\; ???\; -->}}-<!--\; ???\; -->g^{\mathrm{\prime <!--\; ???\; -->}}$, and in the $r^{\mathrm{\prime <!--\; ???\; -->}},g^{\mathrm{\prime <!--\; ???\; -->}}-<!--\; ???\; -->r^{\mathrm{\prime <!--\; ???\; -->}}$ CMD, thus supporting previous theoretical predictions by Borysow et al. The key advantage in using the ${\mathrm{\Delta <!--\; ??\; -->}}_{\mathrm{T}\mathrm{O}}^{\mathrm{K}\mathrm{n}\mathrm{e}\mathrm{e}}$ as an age diagnostic is that it is independent of uncertainties affecting the distance, the reddening, and the photometric zero point. We found an absolute age of 12 ± 1 Gyr that agrees, within the errors, with similar age estimates, but the uncertainty is on average a factor of two smaller. We also found that the ${\mathrm{\Delta <!--\; ??\; -->}}_{\mathrm{T}\mathrm{O}}^{\mathrm{K}\mathrm{n}\mathrm{e}\mathrm{e}}$ is more sensitive to the metallicity than the MSTO, but the dependence vanishes when using the difference in color between the MSK and the MSTO.