I've noticed mine getting harder to manage as I've gotten older too. I'm not sure about supplements that would help, but I notice great improvements in myself when I cut out sugar and drop my carbs a bit. I never go super low with carbs and never zero carb, but I'll reduce them from my normal intake.

Lately I've been completely cutting out all added refined sugar. Even in my condiments. Anything naturally in food like fruit I'm ok with, but if it says added sugar I toss it out. It's tough because it seems like almost everything has at least a little added sugar. I've noticed a great improvement in my physique doing it. I also stay away from anything heavily processed. I don't really eat anything other than meats, fish, eggs, rice, sweet potatoes and veggies lol. Some steal cut oats in the morning I still do. Sounds boring as hell but I've noticed a big change in the way my body looks overall cutting everything else out.