Is it good to start a career as a UX person? What kind of growth can we expect and in what time span?

I would say it's very hard to start as a UX person directly and that it's easier to start with being a UI person and work through. There is more UX work than ever before as companies discover and understand the true value of UX.  BUT many companies are being duped by people claiming to be UX who are really just web designers. Essentially if someone lives in Photoshop and creates CSS then they are not UX but UI. Also, when asked to solve a problem, the first thing they start to do is sketch an interface, they are also UI.  Good UX people are worth their weight in gold and we need more to fight the tide of visual designers pretending to do UX.

Yes, it is great buck, lots of fun and steep growth if you always try to get out of your comfort zone.

I started my career being a web and brand designer, so UI design was the core of my daily tasks. It was actually in the digital marketing space that I honed my UX skills by creating successful campaigns that took many shapes from interactive CD-ROM, banner ads, Flash games to touchscreen signages. From concepting to build, either solo or in a team. Games and high-end digital projects are at the frontier of experience design. Because they often require innovation, creative thinking and technological solutions that cross the boundary into spatial and product design. The rapid turnaround and creative projects taught me as a designer to be able to talk to different audiences, communicate a variety of content and try different technology and channels. Mobile and tablet apps are some of the more recent media that are gaining importance over desktop. In that kind of environment your product or creative solution does not only have to work / is highly functional, but also looks beautiful and create the best experience for your target market. So all aspects of UX is important for a designer to understand. This was true, even before the term was popularised in recent years. But I can't emphasize enough how crucial the visual and interaction design aspects are because these are what customers interacting with. In the last two years I'd worked with and seen plenty of so-called UX designers who were actually business analysts, Information Architects or content editor disguising themselves as 'UX or experience' designers. One common symptom they all shared was a misconception that UI designers only do 'pretty pictures'. For me it comes down to what area are you specializing in. And if you want to append 'designer' in your title, make sure you are well versed in interaction and visual design too.

Yes, if you understand users, problems, needs etc.. And you are logical, analytical and loves solving problems and delighting users. If you have passion and attitude to achieve goals, you don't have to worry about growth. Shoot for excellence, and success, growth will come alongwith..