PLEASE answer. Does age play a factor in a blog?  

I thinks the more older the person, is more wiser if the person is a learner. I don't mind to read his blog. Doesn't matter how old the important thing is the contain of the blog. There is some view i can use for my live.

I do not think that the age of the blogger is significant. It is the content of their blog that is important. I will read anyone's blog as long as it is interesting.
Most people will read blogs written by bloggers about the same age as they are because these blogger tend to write posts that interests people about their age.

For me age is not a factor . If the blog has useful information and interesting enough to attract readers then I think its a good blog and it does not matter what age group the blogger belongs to.

I have seen some really crap blogs from old blogger and some really fantastic blogs from under 18 blogger

It would depend on the topic of the blog. If it's a serious topic, then I would want to read from an older person. But if it isn't serious, then it would be okay for me to read from a teenager.

maturity and writing style have more to do with the success of the content than does the age of its author. However you look at it when blogging content is king for the reader. There is very little I want to hear about a whiny 13 yo girls life, but if she is a great xbox gamer or knows php programming I wouldn't have a problem reading her blog if she knows how to use spellcheck and use proper grammar. That last item is something even a lot of 50 yo bloggers haven't mastered.