My own DH, bless him, is the same weight at 70 as he was at 20.
I, on the other hand, have a different metabolism, I’ve had four children, three much later than most at 39, 42 and 44, and am very overweight, some 6 stone heavier than I was at 20.
He often comments, not very discreetly, about my health and wealth, he’s so right, but it shatters my confidence.
We eat the same foods, but I’m not great at portion control and he snacks on copious amounts of chocolate at night! GRRRR!
At 67 I have borderline under active thyroid, not enough to warrant medication and have a myriad of other conditions, which makes exercise very hard, even walking, none are caused by my obesity but certainly being overweight doesn’t help.
Pre-covid I attended a gym 5 nights a week after work, with a lovely (skinny) friend and acqua twice a week and was much lighter and fitter.
It’s so sad, I think people without “weight issues” think we fatties are lazy and greedy, seeing the amounts of comments which state”it’s easy, eat less, move more”, it’s not always that easy for some of us.
I’m not surprised Narnia that your confidence is rock bottom, but please go to your daughters wedding, wear your dress, hold your held up high and your love for her will shine through and you’ll enjoy the day.
I know this as one of our daughters got married 18 months ago and I dreaded it, I too never wear dresses or bother with make up, but I bit the bullet, found a dress and shoes I felt comfortable in and had a great day!
Go and be proud of your daughter and yourself 
Btw, in my humble opinion, house moving and future proofing should happen whilst you’re still able to easily do so, it’s never too early to move to a bungalow!