What is your best process to buy aged domains/websites? Also please include tools you use to check those.
Don't buy aged domains. Buy domains with a lot of backlinks. It's useless to have 6 years old domain with 1 backlink. lol. To check, for example, if you check the domain marketplace of this forum, often, the seller gives the domain's data such as age, backlinks, pr, etc. You can also check the backlink yourself. Use Yahoo! Site Explorer.
Have a look at flippa see what type of sites are selling there.. I do know of a peice of software but you have to buy a product. the software comes with the product. The product is not cheap..
Well said. Also, there are services out there that will look them up for you at a price. I think that there is a service that is associated with market Samurai's Domain Samurai product.