Basically any trade skill that interests them. At least in the USA we went through a period of time where you were considered to be a loser if you didn't go to college and a lot of the people I went to college with didn't even know why they were there and changed majors many times and now work in a field that isn't at all related to their degrees.

I'm no spring chicken but if i could go back in time I would have went to a trade school and learned a REAL skill rather than all the book learnin that really didn't benefit my career in any way.

Trade skills are not going to die like a lot of the fake ass careers that colleges try to sell to you with stupid degree programs like Sociology and other liberal arts degrees. If someone is interested in just about anything there is a good chance that for damn near nothing they can learn about it and get a certification at a trade school.