How late is too late to take a license?

Not sure anyone read this newsgroup, but let's try.

I work as a Software Engineer somewhere in Latin America, but there are 
two things that I enjoy as well. It's sailboats and airplanes.

I've been considering save some money and start taking classes for a PPL.
Of course at the moment I think about this as a hobby, because I don't 
really understand about the aviation industry.

So, here's my question.
In what age is it still possible to take a license and start flying 
professionally?
I'm 30yo, I think I'm still young of course, but there are some 
industries and professions where I would be considered too old already.

Is it possible to have a career in aviation if I start with, let's say, 
35yo?