If you can come to Canada a lot of resorts have really good deals for learning to snowboard. Lift tickets, rental gear, and lessons for $30-$100 depending on the resort.
I learned in Ontario at Blue Mountain which is tiny in the grand scheme of things, but a great resort to learn at.
As far as the crowd goes, you'll get your usual mix of people. Generally it's a really fun sport with really great people, but you get the odd screwball who likes messing things up for other people.
Other than that, what can I say? My GF started when she was 28 and LOVES the sport! I've been boarding for almost 20 years and I think she loves it more than me!