It is the insertion of the preposition, or the omission thereof, which makes for the alteration of meaning and the subtlety of conceptual differentiation. Note that it is the grammatical playground – “of” – as opposed to “for”; and that small distinction makes for a vast difference. For, if the latter would replace the former, then it would mean a declaration of a solution to the age-old problem of what old age does to us, what loss of vigor for life, stamina in living, and deterioration of purpose makes of us. […]