Yes, of course it's possible. Lots of people turn it around at all ages. Research even suggests elderly people can make changes that have benefits in the longer term.
You need a realistic plan. Forget all the "quick" schemes and fads, etc. Be realistic. If you are drinking too much, don't pretend you can go alcohol free overnight and keep it up. Far better to be honest with how much you drink and just make small reductions, so less becomes the new normal. Same with exercise, just do a little more, then a little more, even if it's just parking at the far end of car parks or walking to the end of the train platform. Every little helps and it becomes the norm. Same with eating, don't cut out all the "treats" as you WILL fail. Better, again, to be honest, and cut things out slowly for the long term.
I used to binge eat in my teens and ended up 22 stones! I went on a crazy diet with lots of exercise and got down to 14 stones in a year. Then I started binge eating again and was back to 23 stones the year later! I was in denial about it. Not just the bingeing but also large meals and eating crap.
It's taken me 20 years, but I've got down from 23 stones to 14 again, very slowly and very gradually, just by "little and often" whether it's been eating slightly less, getting used to smaller meals, stop buying so much crap, walking further, etc. It's reversed my T2 diabetes, high blood pressure, and I feel better now that I did when I was 18! Being more active and eating less and better quality foods (fewer carbs, fewer additives, low sugar, low fat), year after year, makes a massive difference to me.
Because I never made "Big" changes the second time around, the exercise and healthier eating just becomes a habit and you really don't notice the changes over the months and years. What's even better is that when I "fall off the wagon", with either binging (still do very occasionally when stressed) or fancy a treat, I don't feel guilty anymore. I just think "tomorrow's another day" and get back to the fit and healthy way.