Hey there, just letting you know that I am 23 and I started up MMA training about a month ago. I was orginally 220 pounds at 5'11 in sept last year, now I am down to 180 and doing Muay thai/Bjj/kick boxing 4 times a week, and also following a Kickboxing workout for a fight in sept(which is 3-4 times a day at the gym). I am eating right and I find within that month I have improved greatly. My body is naturally using my hips when throwing hooks and kicks, and I can roll with people that have a higher belt than me in BJJ.
All I can say is, if you love it.. you will get somewhere. if you are going to do it just because you like watching it on TV. You will not get far:P
Just my two cents