By 40, its closer to 80%
Horm Res Paediatr 96:128143
For example, foods rich in polyphenols include berries, grapes (red wine), apples, pomegranate, citrus fruits green and black tea, coffee, cocoa and dark chocolate, nuts and seeds like almonds, walnuts, hazelnuts, flax seeds, chia seeds, sesame seeds onions, spinach, broccoli, asparagus and olives and spices like cloves and cinnamon
Another study suggested that an oral dose of 1,200 mg of lipoic acid in subjects with multiple sclerosis could help achieve serum lipoic acid concentrations similar to those found to be therapeutic in mice (96)
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(PubMed) McEvoy CT, Milner KF, Scherman AJ, et al