As an over 50 male who recently started the Ballroom journey, I'll share some of my thoughts and experiences.
I initially took lessons with my wife so that we could attend a wedding and not just 'sway' on the dance floor. We had a few private lessons (no way would I have even considered taking group lessons at that time). We took several private lessons and learned just enough Rumba and Swing to dance at least a notch about swaying.
Wife and I both continued taking lessons, group lessons since we felt we could get through a group lesson now without looking like total fools. Ha ha, I was wrong on that one, wife was fairly adept at picking things up, I on the other hand was agonizingly slow to learn.
We continued for a while with group lessons until the wife decided it was a little too hard and she was just not that interested in carrying on. I on the other hand plowed ahead (literally) with the hope that one day I could actually dance with someone and they would not be disgusted at the end of the song.
After well over a year of group and private lessons I finally got over the hump and could dance a few dances reasonably well without plowing over my partner or stomping her feet too badly.
I remember a long stretch where I could dance with my instructor, but with anyone else I was a mess.
All that being said, from my perspective, while ballroom in general can probably be learned by most anyone at a reasonable cost via group lessons - from this man's perspective, the biggest obstacle to entry was one thing - FEAR!
Fear, knowing you don't know how to dance.
Fear of how others will react to your attempt to follow along in class.
Fear of looking like a fool.
Fear of dragging the group down.
Those were all huge issues for me.
Talking to other men that know I do ballroom now, many have said they'd love to do it, but can't take that first step, because of fear.
It's been well over 2 years for me now.
I've done several Pro/Am competitions and have recently begun working with another Amateur so we can do Am/Am comps. I enjoy Pro/Am but the cost of competing has pushed me to explore Am/Am.
I still train with the same Pro (an independent) and plan to continue doing Pro/Am with her, but the long term goal is to be competitive in Am/Am.
My Amateur partner is just as excited and focused on competing as I am.
We're both in our 50's and neither of us had any past ballroom experience.
A lot of what she knows I've taught her, which in itself has been a huge help for me.
Having an amateur partner to practice with has really helped me on the Pro/Am side as well.
For me, Ballroom improved my health, my marriage, my overall outlook on life and has introduced the wife and I to many wonderful new friends. I'd say it's the best therapy ever!