We are in our early seventies - neither of us have ever been overweight. Mine has fluctuated by a few lbs over the years, while my husband has actually got thinner although he loves food and eats very well.
We are retired and a typical day's meals are:
Breakfast: Porridge( made with milk) and a bit of sugar. Slice of toast (with butter and marmite or marmalade. Fruit juice, coffee
Lunch: Crackers/oatcakes with cheese/hummus/tuna/sardines and a salad (rocket/lettuce, carrot, celery, onion,peppers - home made French dressing) Apple and banana, slice of home made cake and coffee.
Supper: Pasta with some kind of sauce/curry and rice/casserole with potatoes and veg, spanakopita with tomato salad,mushroom omelette with potatoes and veg. Piece of fruit afterwards.
I've always cooked mainly from scratch - don't buy any jarred sauces etc, although I do sometimes use Pataks' curry pastes (not the sauce) as a base. I tend to improvise with what I have in the fridge rather than stick closely to recipes unless cooking for a special occasion. We always have some kind of vegetables with a main meal (peas with fish and chips, broccoli with pizza, etc. We've had a breadmaker for many years (and usually make 50%/75% wholemeal) very rarely buy bread - we both love bread and rarely have any going stale.
We have butter and full fat plain yogurt for cooking. We don't keep any biscuits/crisps/sweets in the house - if we do have them we eat them very quickly! When the children were at home we had crisps and chocolate bars for lunch boxes only. We do live opposite a small supermarket so occasionally buy a chocolate bar there
Probably have a bottle of wine at the weekend, or a couple of gin and tonics, or beers. Generally drink a couple of filter coffees a day, plus small glass of fruit juice and maybe a mug or two of tea. Neither of us go to any length to drink extra water unless feeling thirsty.
We make an effort to walk or cycle at least a couple of miles every day - use buses generally rather than the car locally so that entails some extra walking to bus stops. We can still do at least 10 miles fell walking if on holiday. I do Pilates online twice a week.