Dialysis, used to compensate for the sub-optimal renal function, removes waste products, toxins, and excess water and salts from the blood. The same technology can be used to remove the currently identified SASP (senescence-associated secretory phenotype) components form the blood. SASP comprises pro-inflammatory cytokines and other molecules that induce senescence in the neighboring cells in a paracrine manner. As and when other SASP components are identified, they can be targetted as well.
Also, the blood of the patient can be enriched with factors from the young blood that improve the aging phenotype.
I understand that this is not a permanent solution to stop aging. However, this is feasible and can be realised in the near future. Removing SASP components from the blood will surely slow down the rate of aging.
Tchkonia T, Zhu Y, van Deursen J, Campisi J, Kirkland JL. Cellular senescence and the senescent secretory phenotype: therapeutic opportunities. J Clin Invest. 2013;123(3):966–972.
Villeda SA, Plambeck KE, Middeldorp J, Castellano JM, Mosher KI, Luo J, et al. Young blood reverses age-related impairments in cognitive function and synaptic plasticity in mice. Nat Med [Internet]. 2014 Jun 4;20(6):659–63. Available from: http://www.nature.com/articles/nm.3569