Peter, hard to say on the people who have posted on this board as regards age.
The CNC board tends to be younger to middle aged people and it’s not all electronics, that’s only a small part of CNC most of the router crowd make their machines as opposed to converting a mill or lathe.
True they start off with MDF frames, drawer slides for linear rails, screwed rod for leadscrews and they usually get some help off others with the turning of the ends, bearings etc.
However the MK 1 leads to the MK II and somewhere along the line they have a small lathe, working router and by the MK IV possibly a mill and they are the people helping the next generation out.
Just had a thought to put it in perspective,and this is what I mean by it’s not dying but evolving. On the web is a site called CNCZone, stick www in front of it and .com after if you want a look.
This is the www, equal to the UK CNC router forum but covers far more. It has 162,400 members and so far there have been just over 800,000 posts, 433 posts in the last day alone.
It was started on March 1st 2003 and before that nothing existed.
This site covers everything from little desktop routers to large machining centres but all owned and run by hobbyists but they are mostly very practical people.
John S.