It`s good you brought us back to the issue: resentment by older members of younger members, with kids, in a Club.
I wonder if that was just something the person knew you could not argue back on, being comparatively young with a young child, but in reality just a stick to "beat you with", not the real issue. Arguably the real issue remained the undisclosed overheard conversation taken by the person as applying to him. But, I wasn`t there.
I`m assuming the touching of your wife by this person had incendiary effect ending any chance rational discussion. It sounds a very unpleasant incident. I suspect you are well out of there.
Once a this person could attract majority support, even in cooler days following the incident, to the point you should not remain, your position was lost.
Senior members of a club can feel proprietorial. Support systems of members within a Club can be strong, outweighing the merits of the issue. Life is often not fair. Members of many clubs are older than you. The cost of boat owning, for most a luxury after more essential assets and financial support systems are in place, militates against the number of younger boat owners, but there is no excuse for reverse ageism. I would have expected a club with aging members to value incoming younger members, if not, it is not a good place to be, and you will do well to start again somewhere more hospitable.