How long before perishable products pass their prime

Real Simple provides a useful guide to how long dozens of products last. Some examples:

• Ketchup
Unopened: 1 year (After this time, color or flavor may be affected, but product is still generally safe to consume.)
Opened or used: 4 to 6 months (After this time, color or flavor may be affected, but product is still generally safe to consume.)

• Pickles
Unopened: 18 months
Opened: No conclusive data. Discard if slippery or excessively soft.

• Tabasco
5 years, stored in a cool, dry place

• Batteries, alkaline
7 years

• Lipstick
2 years

Link (via MAKE: Blog)