Can anybody tell me what are the health forum sites which have high rank and also have good age. Please help me.
It wouldn't hurt to do a basic google search and then check the attributes of those domains using an external tool.
If you are looking for sig links, then forget all that you know about link building...as most of the perks of a sig link are different then normal links. Check out these threads instead: Forum Link Building tips (it's not just your signiture!) How to get backlinks from forums and blogs and not be labeled as a spammer Buying sig links? Read this first! You will find that it's the CURRENT popularity of a forum that is what is wanted over what used to be...and the current best forum in any niche can change almost daily (to one degree or another). So a forum that started just a month ago but is just hoping today will offer you more sig link wise then one created years ago that no one really visits anymore. You'll also find that PR is very hard to find on a forum, at least when looking at the threads themselves. Yeah, some threads have PR, but not many. The best perk of sig links would be the click through rates from interested members and guests... so even a NOFOLLOW sig is well worth the efforts if the forum is booming and the post you are making is worth reading. *shrug* Most importantly, do NOT spam! Put the forum you are posting on first (before your links) and you'll find your links can go a LOT farther.