1. Senin, U., Cherubini, A. & Mecocci, P. [Paziente Anziano, Paziente Geriatrico e Medicina Della Complessità. Fondamenti di Gerontologia e Geriatria] (EdiSES, Naples, 2013).
2. Cesari, M., Vellas, B. & Gambassi, G. The stress of aging. Exp. Gerontol. 48, 451–6 (2013).
3. Tinetti, M. & Fried, T. The end of the disease era. Am. J. Med. 116, 179–85 (2004).
4. Franceschi, C. et al. The continuum of aging and age-related diseases: common mechanisms but different rates. Front. Med. (Lausanne) 5, 61 (2018).
5. Mitnitski, A., Howlett, S. & Rockwood, K. Heterogeneity of human aging and its assessment. J. Gerontol. A Biol. Sci. Med. Sci. 73, 877–84 (2017).