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Its never too late to start man!!
just build off your 3's and work your rail game and it will begin to come a lot easier.
for me with rodeos I just watched a ton of how to videos then went and threw my body around until I stuck one (took a few days)
and with cork I did a lot of practice on trampolines to understand how to throw them and what the rotation will feel like. after that I took it to snow and sooner or later I stuck one.
So just keep moving at your own speed with whatever's comfortable. but what I found helped most was 540s, being able to land switch on a spin bigger than a 3 was a huge learning curve for me
Good luck and Happy Skiing!!