It’s obvious: Kids that have early contact with technical toys, literature and tv programs will grow an early interest in these things. It is important to let children do their own experiments so that they are able to find their own solutions for problems they recognize in building and bringing something to work.
Lego Technics is a very good start for children who are curious about building more challenging things than just simple Lego towers and houses for example. If your kid is already building up parts quickly, then you should consider giving it a more complex toy to build up, even if the package says it’s for older children. Parents often find out, that their kids are able to do much more difficult tasks than the ones that are recommended for their age group.