I’m finishing my BS at 39 and debating on doing a Masters or PhD (if I can get into one). I keep circling back to the premise that I want to do a graduate degr

I’m finishing my BS at 39 and debating on doing a Masters or PhD (if I can get into one). I keep circling back to the premise that I want to do a graduate degree in Philosophy or maybe History. Something that really interests me, rather than an MBA or a STEM degree (undergrad is STEM). Looking forward to seeing the comments here.