You're 2 years older than me.
I cut bread after getting diabetes and replaced it with eggs, beans, broccoli and onion omelette. My body transformed withing days. My beer gut (it was small) totally disappeared and I actually put on weight, bulking up on the chest and arms.
Eat brazil nuts and sultanas as well. All nuts are good, also pumpkin seeds.
We old farts cant let the young guys outperform us LOL
You need eat a testosterone rich diet. You'll be surprised by the results. Your hormone production is what keeps your body strong. Build your muscles with workouts of about 45 min daily, but more importantly, eat testosterone rich food.