Aging or comorbid conditions - what is the main cause of kidney damage?

Conclusions: The influence of aging alone on kidney damage is not evident. Moreover, it is different in males and females. Hypertension is the only coexisting comorbid condition contributing to kidney damage in both males and females. Advanced age together with comorbid conditions is more harmful to the kidney in males.
PMID: 20349419 [PubMed - as supplied by publisher] (Source: Journal of Nephrology)