How important is Ad Group age?

[Qon]

We have an relatively old ad group running (from 2009) with an okay history. The average CTR is 3,19% and average position of **4,2. **

But the conversion (on website) is not really great. This has to do with bad landing pages, on products we don't actually want to sell. It's complicated but we have a new, better, landing page that we would like to advertise. Some ads would have to be combined, and others will have to be removed. Also the URLs will change.

It would probably be best to start a fresh, new, clean ad group with a better structure. It would also be less work. The problem is; would this be a waste of the age and history of the current ad group? How big of a factor is this?

[KevinBudzynski]

I think history is a factor, but not a major factor. Typically when I begin a new adgroup I bid a higher cpc to get good impression/ctr numbers and slow off later on as it seems that adwords will embrase your adgroup better than not doing it..