I agree with what he said in general, but aged domains help you in building seo networks.
Use a new domain and point 100+ links to quickly it and it will be either sandboxed or penalized, which is not the case with 5-10+ years older domains.
Speaking of which, I have some aged domains for sale -
http://www.gfy.com/sell-and-buy-forum/992771-1993-2000-aged-domains-pr-traffic-backlinks-bargain-prices.html