I started at 40, excluding a couple times dabbling in college. My wife switched from skis to snowboarding at 43 when our kids aged 6 and 9 took it up.
Go for it, tons of fun.
Watch a few how to videos, rent some gear and book a lesson the very first time out, and some more lessons after that.
If you do lessons right away you'll learn quick and save yourself a lot of wasted time and hassle. You'll still fall down lots and have a sore butt of course but lessons really help.
If you're thinking of getting your own gear right away buy some new mid flex boots that fit really well after trying on lots of them, and the board and bindings don't matter much. Suggest you rent the board/bindings a couple times, get something 5 cms shorter than what the online calculators recommend for your weight, then buy something the proper size later, a shorter board is easier to learn on.
Post your questions here, folks are knowledgeable and helpful.
Snowboarding is harder to learn for the first few days than skiing but after that it's easier to progress, you will most likely move from green to blue to black faster than you did on skiis.