I have a 15 year old domain, its currently a PR4 and I personally have had this for a few years now. It is in a niche that has insanely high Adsense CPC's, on the low end $10 and at the high end $70 with potentially hundreds of related keywords that fall into these cpc ranges and traffic for each individual term is in the low to high thousands, so they are searched for terms.
The problem is that the terms themselves are fairly competitive, mostly dominated other aged sites that have been in their positions for a long time. Generally, I see ranking pages on the low end at pr3 with a few hundred links and on the high end pr5+ with thousands of links to the page.
Because of the competition I have sat on this website for a while without really doing anything with it, I haven't worked on it well over a year but it does get a few clicks a week on Adsense.
My question is this, because of the sites age is it worth going after these more competitive terms and would I have a farts chance in a whirlwind of ranking it for any of these terms?
Also, I hear people say that you can blast the hell out of an older domain like this without really any issues arising, what is your take on this and how would you approach ranking this site for these competitive terms?
Thank you for all of the advice and help. It is very appreciated.