I think my youngest was right around 1. I can't remember with my oldest. Its one of those things that it can't hurt to let them try. So if baby is interested, go for it! :)
I agree with showing interest in feeding themselves. Here's a help link:
http://blog.homemade-baby-food-recipes.com/when-should-i-give-my-baby-a-spoon-to-feed-himself/
Quoting mommyto3bees:when they start showing interest in feeding themselves
when they start showing interest in feeding themselves