OP, I promise it's not.
Until last November I was a stone and a half overweight and I was adamant it would not shift.
I blamed my age, my medication, my job...and then one day I decided just to log everything I ate on My Fitness Pal, just to see if I was overeating.
Fuck. My. Life.
I thought I knew about food and nutrition. Somehow that didn't stop me from inhaling a whole meal's worth of calories in five minutes via a handful of Celebrations while at work 
Since then I've lost 11 pounds, through logging my calories and buying a Fitbit to keep my exercise up.
I've done it slowly on purpose, because this is a lifestyle change, not a diet.
I've had chocolate, wine, chips, pasta...I've not felt hungry at all, except when you're supposed to.
Today I got into a pair of jeans I haven't fitted into for about eight years - I thought I'd never fit into them again. Not only was it was possible - it was easy. The only hard bit was making the decision to take responsibility for my own health.
I'm 42 too, by the way.