Female, currently aged 45. At 38, I had the chance to take a business trip out to Aspen and so while I was out there, I signed myself up for a few days of snowboarding lessons. I had tried skiing a few times (no lessons) when I was in college and I didn't find it easy or all that enjoyable and hadn't been on a mountain since. I enjoyed my big west trip. Instructors were great. Classmates were great. It was social and fun. As others have said, it was also painful. In snowboarding, the hardest part is really just figuring out your balance. It takes a few hours to a few days to get it. Once you get it, it's easy. Before you get it, you fall on your butt a lot. But I still had a blast. And I returned to the East Coast with a desire to do more. I bought my own snowboard and went to Liberty several times for the next two seasons. Since then, I've taken other snowboarding trips to better places.
I think what you're thinking about it a great idea. Honestly, falling on your butt a bunch isn't fun. Why not do it on a trip to a beautiful locale? Stay at a nice resort, soak in the hot tub after, flirt with people at bars at night. Repeat. Come back to shitty, boring Liberty already knowing the basics and use their little runs to get better and maintain. I'm 45 and still enjoy snowboarding. The camaraderie is great. Before I met my guy, I would sign up and go on snowboarding trips with local groups or would just go by myself and always made friends. I got married at 42 and my husband, who could ski double-black diamonds but had never been on a snowboard, is now exclusively a snowboarder as well. He says its WAY easier on his knees than the skiing was. I heard the same from a ski patrol person at a resort this past season--she was in her late 60s and had recently switched from skiing to snowboarding. While the first few days suck b/c of all the falling, after that time period, the general act of snowboarding is much easier on the body than skiing. I've had lots of people also tell me that, while your first few hours/days on skis are easier, you can progress with your skills on a snowboard faster than on skis.
If you're feeling the call to try out snowboarding, don't let anyone hold you back. It's a real joy of mine and my husband. Two old people tearing it up. Sure you have to bend over to strap into your board. Sure sometimes you get stuck on a flat spot and don't have poles to get you out. But our boots are more comfortable than ski boots. And our clothes are WAY more fashionable.

ENJOY!