The growth of the spin-glass correlation length has been measured as a function of the waiting time $t_{mathrm{w}}$ on a single crystal of CuMn (6 at.%), reaching values $xisim 150$ nm, larger than any other glassy correlation-length measured to date. We find an aging rate $mathrm{d}ln,t_{mathrm{w}}/mathrm{d}ln,xi$ larger than found in previous measurements, which evinces a dynamic slowing-down as $xi$ grows. Our measured aging rate is compared with simulation results by the Janus collaboration. After critical effects are taken into account, we find excellent agreement with the Janus data.
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