To the Editor: In a previous issue of the Journal of Frailty & Aging, Houles and colleagues presented a review paper entitled “Frailty and cognition”. The association between frailty and cognitive impairment was proposed, and Authors discussed a large amount of evidence. However, a number of conceptual and methodological issues should be taken into account as potentially affecting the possibility
... [Show full abstract] to include cognition in the operational definition of frailty (as suggested by Authors). Frailty should be considered as a construct under development and several concepts are still intensely discussed.