Senility is the term used to describe being senile; this is the decline in cognition and physical health associated with aging. Senility is not the same as Dementia, although the two conditions are closely related.
Antiaging treatments and supplements designed for senility are largely the same as those for dementia and improving cognition, including nootropics that improve memory and concentration, Gerovital-H3 for a range of rejuvenating benefits and NADH, which boosts energy and helps to fight infection.