If you apply for a masters and are offered a place, then it's obviously ok academically, from the college's perspective. If your professional background overlaps with your intended masters, you could potentially apply new ideas and theories to your work and see it from a fresh perspective, which may be valuable for you if you want to make a career change. Some courses positively encourage mature students because of the variety of life and work experiences they bring to the course. I hope you find the right course to suit you - good luck!