I am also 67, sustained a VERY severe orthopaedic injury, major physical trauma to right leg, spine and minor to skull, May 05/1960. The doctors warned my parents that I might never walk again without support and mechanical assistance and then screwed up the corrective surgery.
I had wanted to become either a "game warden" or a "forest ranger" and was told I SHOULD, given my "top of the school" academic standing in "the humanities" become a LAWYER....I HATE lawyers!!!
Five years later, I was accepted into and taken on permanent staff of the BC Forest Service........I often fall down, but, I NEVER totally quit.
Now, I was born and raised in the BC mountains, superb Elk country and spent much of my working live actively in wilderness employment. Elk hunting is my favourite, only serious Grouse hunting excites me as much and I STILL backpack hunt any time I can get out.
So, YES, you CAN do it and if you can afford it, a guided hunt in northeast BC, an "Elk-Moose combo" will be an experience of a lifetime. You can drive there in a van, bring all the meat home with some sound planning and the elevations are often only 3500-4500 ft., which is MUCH easier to cope with than 8000-11000 feet.
The "secret" is consistent training on a rubber running track near home and climbing the bleachers. Get a GOOD pack and start with a 20 lb. load and work up to five miles per day, four days per week, with 50 lbs tops and DO the bleachers, as much as you can force yourself. Do NOT "run" the bleachers, too much chance of an injury and you are not doing this to impress or compete with some "internet superman",( most are full of [bleep]), but, to
ENJOY a life-enhancing activity.
If, I can, as I often have and do, assist with anything should you want to come to BC, just PM me and I might have a few useful tips.
GO FOR IT, a B&C 375" 6x6 is waiting!!!!