not over 40, but not sure why that matters.
I ride with a big crew of women, some pushing 40, some just barely 30, I am 35. We wear what we like, and generally speaking that means high quality stuff that works in the resort, and lighter weight stuff for the backcountry. Lots of Arcteryx, Stoic, Oakley, Special Blend in our group (which also happen to appear on Brociety a lot). Oakley and Burton have nice zipper powder skirts. My current favorite combo is my orange Arcteryx jacket and some men's Oakley pants I stole from JMH.
I prefer men's pants, because I can put my phone, wallet, binding tool and flask in them. Women's pants sometimes have stupid pockets. I also like big pants, because you can really move in them when jumping. I wear D3O knee pads (which I also use MTBing), which fit better under bigger pants, too. Wear your pants as low as you like, don't listen to grumpy old ladies.
Also, as you might notice int he pics below, a lot of your bike stuff crosses over - especially stuff like base layers and armor. Get a snowboard specific helmet.
Snowboarding rules. I like it as much as bikes. 24 days on the board already this season...
