I have been feeding purina cat chow senior to my indoor siamese  for
about 8 years now.  I think she is about 16 or 17.  And she is in very
good health.

Purina included a $1.00 off coupon in the latest bag of food for a new
brand line.  It is called Purina Cat Chow Vitality.  And it too, is
for "mature" cats

Can someone tell me how this Vitality brand differs from their new
Vitality brand?  I haven't checked any stores yet to see how much it
costs.  I assume more than the Senior brand.  I am just wondering if
any of you cat experts out there have an opinion.

Thanks!