AOL is good for children, lots of parental controls etc. Easy navigation and understanding and there is always help on how to do something.
However, AOL connection is sometimes unreliable and can be slow.
You can try it for free and see what it is like - trial cd is available on computer mags, or you could go to www.aol.com (or .co.uk) and order your trial CD. Sorry I can't remember the phone number.
If there are adults that intend to use it also then there may be more reliable and faster ISP's available.