I wasn't a by the book kind of mom. Yes they do say you should wait till around 2 years of age and I guess it's now 3.
I had planned on waiting to give my son peanut butter only because my father has an allergy. I had forgot to mention this to one of my friends who was watching him and she had given my son a PB&J sandwich at the age of 14 months.
Thankfully he wasn't allergic and he's now 5 years old and still no problems.