8 month old domain cannot be an aged one,at least 1 year in my mind...

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couple of months... a year... 10 years... doesn't really matter if you are planning a real, long-term business

3 years in my opinion will be considered an aged domain!

God Bless,
Jeremiah

When exceed to a year. Its consider an aged domain.

As old as you can get them!!!!

I have domains that are 10 years old that I have bought at auction, some at 8 years and some of 5 years.

I find that it is harder to rank for domain names that are less than 2 years old but it depends on the site, your keywords and the amount of unique content you are providing.

If you feel you need more of a kick you can always buy a 10 year old domain (often costs less than $20) and have it pointing at one of your blog posts.

everybody please remember that domain age is just one minor ranking factor - one of 200+ so the point is don't worry about it

I thought that the old domain is at least 5 years old

I would say 3 years. 3 years makes a big difference in the ranking in my experience.

I think 2 years because that is enough time to get some credibility

When buying "aged domains" I only look at 3 years or older.

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I have bought domains of all ages and while it is damn near impossible to give a solid answer to this question, I still think that 2yr old domains are the prime age.

Anything older that 2yrs doesn't really give any additional benefit for me.