Certainly not. As mentioned in an early published report of mine:

"Barefoot activity when practical (no need for thermal insulation; no risk of crush injuries; social acceptability) deserves consideration since sensory mediated protective adaptations seem optimized for this condition.  Although this may run counter to notions prevalent in economically advanced countries recounting the dangers of barefoot activity and necessity of footwear even when barefoot activity is feasible, supporting data are lacking, and many have concluded that footwear design is guided by fashion rather than health consideration." 

In addition, as mentioned above, the bare foot on natural surfaces may not be ideal for the elderly.  The barefoot is particularly susceptible to damage when perpetually wet, such as in swamp-like conditions.