Domain age is only one of the important factors to rank higher is SE, however the rest of the factors to rank higher also matter. If you analyze results on google.co.uk some of us must have noticed that both new as well as old sites are getting listed irrespective of the backlinks each one has.
Age and maturity is one of many factors taken into account, try to understand that Google works with and indexes pages rather than domains. The age of the domain is no big deal in the scale of things.
simply put it, domain age is something but not everthing. And sicnce it is not something u can control, so how about just do your site building and promoting work, and waiting for it is getting older.
As per my view that Domain name age very important as seo factors becuase when we are trying to optimize our website, then search engine are not considering new domain names in indexing, so try to purchase old domain names.
Age of domain is important - but if you build a quality website first time around you should have know problems, my site went live 5 months ago and I've had no problems and I've got good rankings already.
I believe domain age does have an effect on where your site is ranked but I don't think it is as straightforward as many would like to believe.
You see if Google does use domain age it can be for 1 simple reason, it is because an older domain is better established and reliable, therefore less likely to be spam.