Can I switch from accounting to psychology?

I am so over Accounting and the field. I have never been happy with it but it pays the bills and I have been successful. I am an accounting manager but I hate what I do. I am 47 with no college degree. I know I should not be complaining but I don't know if I cannot see myself doing this for another 20 years. Do you think I am too old to go into psychology? Has anyone made a switch on their careers? Any advice will help. Thank you in advance.