It all depends on how much work you put into marketing your site, and how popular your type of site is. Recycling model train sets isn't going to get any traffic if you don't market it, while daily stock tips will get quick traffic if you do.
Don't forget that organic traffic isn't just something that comes with site age. SEO and traffic to your site also affect it. If you can get good backlinks and referral traffic, your organic traffic level will increase as the search engines give more weight to your site.Great to know. I am in the Personal Development niche. Specifically, finding ways to create an income doing something that you absolutely love to do. There are so many Gurus and big websites to contend with and I really have my work cut out for me.