Aging is a disease

It's not so simple, even if you target lifespan extension.

Harm	Counterfactual outcome	Programmed response to harm	Drawback of response
Invaders	City razed	Siege walls	Starvation
Pathogens	Death from infection	Fever	Hyperpyrexia
UV-induced mutations	Melanoma	Sunburn	Blisters, peeling
Some hallmarks of aging	Cancer, wear-and-tear	Other hallmarks of aging	Frailty, loss of regeneration