I just started constructing a blog on Tumblr 4 days ago, I'm just building up content for about a week, and then I will look for methods to get a lots followers, which is of course the basic need if you want to monetize your Tumblr in any way. I'm posting original content about 10-15 times a day, like pics, articles about games, previews, also stuff about a sports bettors point of view, so I'm trying some more serious stuff too, and then of course I reblog about 10-15 times a day, a lots of time adding some comment to them, also a lots of times putting some tags to them, if they were without tags (my original content always has tags). I want to attract to my blog sport fans for US and Canada pro and college team sports primordially, and if they are sports fans but also doing sport betting at some level, even better. Now, I hope there are here some guys with a lots more experience in Tumblr so I'm wondering if my observation so far from the the Tumblr blogs I visited, I follow, or got followers from is true: From what I see so far, and it's disappointing, no more than maximum 20% of all Tumblr users are over 21 years old. So those under this age are practically useless for future monetizing purpose (not because they are legally under age in US for ex, but just because they are "kids", not serious, without money, etc.). Only thing useful which can they still do if following you is to reblog your posts (which is still something, actually can help a lot). Or maybe I'm wrong, I got this impression because I was looking just at the different team sports fans kind of blogs, (also I checked the NSFW porn blogs)? Maybe mature people are to be find in other niches of Tumblr blogs, but not related to sports, teams, players? Hard to believe though... I wanted initially to begin a blog in the porn area, but then I read that about 19% of all blogs at Tumblr are porn related, the market there is quite saturated, and with the new Yahoo ownership even if they will still allow these porn blogs to live there, but for sure they will not encourage porn to get a bigger slice from the whole of Tumblr than it takes now. Maybe you also could give some advice what to do to get things going better (I have 13 followers after 3 days, and never ever asked anyone to follow me). Thanks.