I'm 63, 5'8" tall and a size 10.
I eat home cooked food, everything including meat, fish, pasta, rice, lots of veg, fruit, eggs, cheese, cream, chocolate BUT....
Everything is home cooked.
Nothing is UPF
I use herbs & spices to add flavour, no sugar-loaded pre-made sauces
I eat wholemeal versions of bread/pasta/couscous. brown rice
I eat 30 different fruit & veg a week
I don't drink alcohol or smoke
I don't eat sweets
I don't snack between meals much
I seldom have dessert
Chocolate is real 70% dark chocolate, not Snickers.
Coffee is decaf
I run 10-15k a week, do at least an hour's karate and lift weights at home.
I weigh about 63kg in the summer, 65kg in the winter. My siblings are all similar so maybe we have good genes, or maybe it was the fact both parents were overweight & had type 2 diabetes.