Heya FB
As someone who got 2 freakin degrees in the area, I can tell you that some of it can be quite fascinating. Although if you're looking to study serial killers or mass murderers -- the real sexy stuff then you might be better off in a psych program.
Phoenix has an excellent program -- it's a true criminology degree, not a criminal justice degree. Was my PhD dream school. And, it's quite inter-disciplinary if you're looking to do something a little more unique.
I'll tell you though....University de Montreal has the first criminology program developed in Canada -- it's definitely a good one. There are also programs in Ottawa, Toronto, Manitoba, and out at Simon Fraser in B.C. --- not sure how many of them are offering their full programs online, but they're all worth checking out.
Good luck, hon....and no....you're never too old to try something new