You're right about many things here. 35 seems to be the number, I was just like you and started to observe change at 35.
I don't drink alcohol but devil is bread and pastry. Have changed my diet, rarely eat bread and pastry now.
Muscles consume calories, fat doesn't. Building muscles is important.

Congratulations for this achievement! I have a high respect for those who can and willing to do it. It's an important milestone that pays off later. Well done! 🏅