Originally Posted by seouk

yes all the websites is optimized whether it is old or new, both the method of work for both r different

Thanks

Can you please elaborate your sentence?

Not this is not necessary to do seo works on old sites only.
SEO works is able to all themes and any type sites. old and new this is not a problem.
you created site than you can start SEO works on your site immediately.
SEO is good methods to get ranking for your sites.

if the seo has done properly,domain age does not matter.

That's true, age factor doesn't matter when it comes to SEO, it can be done for any domain.