Is it normal to still be exhausted 8 weeks post op breast reduction/lift? No complications but still zero energy. 47 yrs old

In my opinion, assuming your breasts healed as expected, at 8 weeks postop from breast reduction surgery, you should be back to your baseline energy. Best to make an appointment with your primary care physician for an exam to make sure there is no underlying health problem.

In fact you may be malnourished.  I find that the patients would not meet their calorie or protein goals early after surgery without specific counseling.  Although you may want to diet, you may be in need of some nutrition.

You may want to check some lab values to see if you lost enough blood from the surgery to become anemic.  This may explain your lethargy.  Starting iron supplementation will help if this is the case.