Hello Shai,
I cannot directly speak to the experience of trying to become an analyst if you are in your late 40s. However, I can tell you that the firm I used to work at hired several people in their 40s whose prior role had been something other than working as a research analyst. So it is possible. I also know that, at least in the United States, investment management firms often prefer people who are experts in their field.
Best wishes for success to you,
Jason