Ok, let's ask some questions:
Currently, what position is your site ranking for your desired keywrods?
Does it look like you started to rank well and then were hit by Panda? Are you currently trying to "escape" Panda?
You said the site is 11 years old. Did you buy it from someone?
(If yes) When did YOU buy it, and did all the registration data, google analytics, and google webmaster account info change when you bought it?
(If yes) How well did it rank before you bought it?
You mentioned, "the links i got are now more than 6 months old," what type of links are those? Are they comments in blogs, forum profiles, or other "spammy" link profiles? Or are they bought links that appear in content? Or are they freely given editorial links? Please be as specific as you can.
Please describe the content on your site in as much detail as you can, without using SPECIFIC KEYWORD TERMS. Is it all original well researched content? Is it mostly user generated content? Is it predominately all photos?
And have you checked that the content isn't posted on other sites around the internet?