What age is appropriate to take my child whitewater rafting?

If your going with a rafting company most if not all of them have age restrictions. Of the ones that I know of require that they be swimmers and 8 years of age for class 1-2 rapids and 10 and up for class 3 rapids and age 16 for beyond class 4. If your doing your own thing using your own gear it's up to you and what you think your kid is capable of handling how well they swim and follow directions.