Like Jeff, I'm also a 68 years old retiree. I have always tended to be that little bit overweight and decided to do something about it when I retired. I left F/T work - as a lecturer - when I was 63 and have suffered from raised BP for about 20 years but otherwise I'm reasonably healthy.
I have been vegetarian for some 30 years, gave up smoking 36 years ago and have been teetotal for the last 5 years, all in the quest for better general health and fitness. I am still teaching P/T and studying another language for interest only to keep my mind busy. I also walk (briskly) up to 25 miles per week. A few months back I had a really busy period with marking papers for the course I was teaching and preparation for an exam in my language study which lead to me not getting in my usual walking sessions; in 4 weeks I put on about 13/14lbs!!!
Now I'm back at my usual routine and thankfully the weight is starting to come off again. I'm also down to less than 1/4 of the BP medication I was on when working full-time and generally feeling much better!
The key I think is the old adage of, 'mind over matter', the matter in this case being FOOD! So to Jeff and anyone else in the same situation I would say, try to get active bit-by-bit, taking it one step at a time; it's amazing how a little bit of walking really hits those extra pounds hard! Another final, personal, piece of advice, is to avoid BREAD and POTATOES like the plague - these turn to sugar in your system very quickly and give you a sudden blood-sugar boost with accompanying 'comedown' making the hunger come back very quickly. When I gave up white bread I lost an amazing amount of weight in next to no time!
I allow myself some air-fried oven chips on Saturdays and steamed potatoes on Sundays then it's back to salads for the rest of the week!
This seems to work for me keeping my weight down and my fitness levels good - BP in the morning is averaging 110/65 and my regular resting pulse is 58.
Let me know any thoughts you may have on my experiences!