Yes
It isn't healthy to take diet pills before the age of 18, especially when you are 4 years below that age. Your body is still growing and will not react well with the pills. Many diet pills can weaken the heart and cause complications. Depending on the state, you may not be able to purchase diet pills below 18 years of age.
Yes you should be proctected provided that you are taking the pills at regular times everyday, but it is still a good idea to use a condom as well.
To my knowledge if you try to smoke hydrocodone pills it will simply wasted the pill, because the Tylenol in it is not a substance you may smoke. It's the same for trying to shoot up the pill too. You simply cannot extract the narcotic out of the pill to be able to shoot or smoke hydrocodone pills.
According to the EMC website at medicine.org.uk the shelf life is 5 years and does not require any specific storage.
Centrum Pills are good like a suplement of vitamines and minerales that you lack in your organism.
Both Semenx pills and Volume pills are good medicines and have side effects ranging from one person to another. On a personal level the Semenx pills is better medicine.
All Vitamins. Niacin. Melatonin.
They will not be harmful, they will either still be good or if they really are expired they will simply not work or not work as well as they used to.
Sex pills
Yes even though it is 11 years old they are still selling them, but it is not as good as a PS3
not much is good after ten years but check the expiration date.