If your content is not updated then "why will visitors come again?" New fresh and updated content will give a new look to your website and retain your visitors as they would get latest information regarding their interest.
Yeah thats very true that content matters a lot for any website and moreover search engines takes it very seriously and good content is the one in which keyword exists
Search engines prefer original and fresh content. It attracts and compels search engine spiders to crawl through your website. It will increase the number of visitors to your site.
Good and unique content will attract attention, inbound links and other referrals. It is likely to give you the best, most stable long-term results. Once established, content-based SEO becomes easier to maintain than other methods.
A number of important factors that must be considered in the search engine optimisation campaign is in force, but without doubt one of the most important factors that must be paid attention to the quality of the content. The content must be given to the number of keywords that you read by search engines.