I'm 55 and had just let myself go over the last 10 years but mostly the last 5.
I managed the whole mindless snacking thing (mostly) by:
stopping drinking random wine - it makes me hungrier for crap the next day. So I'll have wine if I'm out with a friend or eating a nice meal. Not just because it's sunny and I've finished work. Or it's raining and I've finished work.
Eating 3 proper meals a day,
Breakfast poached eggs on sourdough toast with avocado and tomatoes or full fat yoghurt with seeds and fruit.
Lunch - soup with beans or lentils or dal. Usually no bread or white rice.
Evening meal - veg, protein, carb. Grilled chicken, jacket potato, salads or veg. Last night was salmon stirfry with seeds and noodles.
If I snack I have a banana or apple.
I weight a stone and a half less than I did last year and dropped a dress size - but I've only been properly concentrating on this since Christmas.
I've also joined a gym and do more walking - but it's definitely cutting out the crap, like a starter of a packet of crisps while I make tea, or biscuits at work, or a chocolate bar because I'm bored....that has made the difference. I'm fitter from the gym and walking - but that's not the weight loss.
Need to lose another stone and a half as I've just been put on BP tablets...ho hum.
also pretty much stopped buying any crap for the house, Lots more veg and just normal food in the shopping basket.
I'll still pick up a cake for very skinny DH, or he picks one up for himself...but that's fine.