It’s definitely much harder the older you get, but if I knew then what I know now (here we go with old adages lol), I would approach it much smarter.
Anytime I went into a caloric deficit, I would lift just enough to let my body know that it still needs the muscle that I have. I would NEVER stay in a deficit for more than 4 weeks, and never more than a couple hundred calories. My plan would look more like this…
Let’s assume that my maintenance caloric intake was 2600 Kcal, and I was at around 25%+ BF.
Week 1
Slowly drop calories (20-50 per day) for around a week. HIIT cardio 3 days a week for 10-15min per session. Weight lifting 4 days a week (PPL type split) light to medium weight on a 3 set / 10-12 rep routine, 1-2 exercises per muscle group.
Week 2.
Level off the calories at around 2200-2300 and keep the training the same except for increasing the cardio time per session.
Week 3
Add 2 more days of cardio. So a total of 3 days of HIIT and 2 days (the days I’m not hitting the weights) of SS long duration cardio.
Week 4
No change.
Week 5
Slowly start ramping calories back up 20-50 per day and drop the 2 added days of cardio.
Week 6
Level caloric intake off at around a 100-200 calorie surplus and add 1-2 more days of weight training.
Week 7
Start transitioning back into a more traditional building routine, incorporating heavier sets.
Weeks 8-16
Stay the same varying workout and cardio styles (but keeping no more than 3 days a week on the cardio)
Week 17
Start over.
I would repeat this cycle for as long as it takes to drop to around 16%-18% BF then forget about deficits again forever and focus on muscle building alone. The more muscle you ultimately build, the more calories you will require to maintain that mass so it’s important to re-evaluate your RMR from time to time.
Also to note, after a while, when your metabolism is in a healthy place, you really don’t have to count calories so much. Just listen to your body and it will tell you when it’s time to refuel. If you create habits of eating the right kinds of food, enough of it, and at the right macro ratios, the body will start working WITH you, instead of fighting against you.
Hope this helps to answer your question.