It doesn’t seem that 48-hour recovery from strength training changes very much from early adulthood to middle age, at least for untrained lifters. Middle-aged lifters may be more apt to accumulate fatigue over the course of a training cycle, and there may be a difference in recovery for more highly trained lifters; those are issues for future studies to address.
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Comparisons in the Recovery Response From Resistance Exercise Between Young and Middle-Aged Men. doi: 10.1519/JSC.0000000000002219.