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Is there a way to remove old URL's that are still being used for my keywords for my on page optimization? They are giving me grades of F since they no longer exist and if I change the URL to the current one, the grade becomes an A, but they are still showing after the new crawl.

Does content placement on a page have any effect, bring up top as opposed to bottom as opposed to embedded within? On my product detail page it comes up last after image, social section and add to cart

I have a site where I have 5,000 new products each year, I never waned to deleted the old pages due to links pointing to them and keywords.  But I now have 20,000 plus pages, does having that many pages spread out my link juice or does it effect me in any other ways over having a site with 5,000 pages or should I keep not deleting old pages so I dont loose any links? Along with that I currently do not link to my old pages from my site so Im guessing google does not get to them very often if at all, if you agree to still keep them should I link to them somewhere? Because the products are not that simiiar and they do bring added value I dont think canonical would work here

Should they be different

do you think google counts the H1 of the landing page from an anchor text, for example if the anchor text of my product is .  blue sexy X, do you think its good if the h1 of the landing page says the exact same thing

General title tag questions how important is it not to change your title tag, I own a prom dress site and I'm always changing them between prom and homecoming' Is it bad to have title tags that are only different by one word across thousands of pages on your site.  I have thousands of dresses so each title tag only varies by the style # I have always had title tags that are for example black prom dresses, well i recently discovered that just black dresses is googled 10 times the amount so im debating changing them to black dresses so that the word dresses is closer to the front of the title tag, am I over reacting or is that a good idea or would it be bad to put black dresses, black prom dresses, black homecoming dresses I also put the year in almost every title tag 2012, is that bad, I ranked great for 2012 stuff but could it hurt my homepage domain rankings on major broader keywords