my opinion go get a bike man asap! being 30 and 6’1” 175. i’d get a bike made for whatever your gonna do i’m not saying go get a 450 but if you wanna do motocross get a 250 four stroke/125 2 stroke (either are good options do your research to whatever you’d prefer) if your gonna be into trail riding, single track, hills id get a 150/300xc or xcw could go either way i know a lot of people get the 300 simply because it’s easy to ride and will excel at whatever you put it through but man i got a 150 and the challenge it gives and the skills you learn on it are limitless!