I recently turned 36 years young. When I was in Jr. High, I collected some Marvel titles but moved away from comics towards novels in high school and college. Six or seven years ago, I was lured back into comics when I discovered trade paperbacks and graphic novels in my public library. I do keep up on a handful of new titles (Scalped, DMZ, Powers, Fables) but find myself reading mainly golden age and underground comix just as much if not more than new material.
As far as comics appeal to the young goes, both my 5 and 7 year old read comics, and I'd hate to slight the industry too much for the state of children's comics because I think good things are happening. Both my kids love the RAW toon books like Benny and Penny or the Johnny Boo books which are available in the kiddie section of our library and which I think is a great format for getting children interested in comics. Also, the Boom Kids comics are a ton of fun, and my kids also like to read Harveys, or I like to read them old Dells. There's more material available right now for kids than there has been in a long time. As far as Marvel or DC's appeal to children goes, I'll be honest and say I could care less. They aim their comics towards their target demographic, 30-something fan boys willing to pay 5 dollars an issue and mine a small and blindly loyal audience for all it's worth.
I think comics offer much in terms of exciting children to read and also as a format that helps children learn to sound out effects, understand sequential images, and decipher dialogue. Educators and parents are more open to this than ever, so I'm optimistic about the future of comics and comics for kids no matter what the demographics say or what is on offer from the big 2.