Architecture can be age-sensitive. In addition, entry level architects don't make much money, and there are very few jobs available. I'd thus have you research the realities of architecture where you live or want to live, see what you're up against and if the career change is worth your time, money, and effort.
You may want to look into some other fields. Perhaps those where your GD experience would be related to the new field, fields that pay decently and are welcoming of older career changers. Maybe marketing, if you get an MBA from a solid program and do a marketing internship as part of your degree.