The maker of Centrum multivitamins introduced Centrum Silver, a vitamin designed specifically for older people. Centrum Silver is an example of a , a product that uses an existing brand name in an existing category but with a new formula.

Line extension

Explanation:

A line extension is the use of a known product brand name for a new product in the same product category. Line extensions is as a result of the introduction of an additional item in similar product category using the same brand name such as colors, forms, new flavors, added ingredients etc. Line extension takes place when an organization's product line is lengthened beyond its current range.

A line extension helps organizations identify and meet the needs of the consumers. When appropriately applied, the advantage a line extension of a product gives are numerous.

Centrum multivitamins introducing Centrum silver which is for older people is a product line extension as the product is using an already existing brand name.

(75years ,i believe is the correct answer.good luck