Hi my friends, In my post "How long will a new domain rank top today?" I got many very useful replies, thank all the friends who replied to me, that's my pleasure : ) After reading the thread I posted, now I know that the aged domain is better than new domain for ranking, but the problem is how to analyze which old domain is worth to purchase and rank for? Is there any software or service could scrape and analyze the old domains for selection (get its TF or authority value, avoide the domain which has been penalized in the past etc.,)? Or just go to the expired domain selling site to select the domains manualy? Any kindly friends could recommend to me?