No problems here in Brazil. But, frankly, I do not think that people should ask it to women; mainly if she is an old person. She probably wouldn't feel comfortable. But, of course, it depends on the person. Some men might feel like that too. In my case, for example, I have no problem about it.

Generally, for us-Russians it is not insulting to ask age of the person, but it could be inappropriate to ask a woman how old she is.