A video that really inspired me already long time ago that i want to share is from a normal guy in Murica that is in his 50s and was able to go from Fat to Six Pack in 1 year:
When someone that works full time, is around 50 year old can make such an immense change in 1 year naturally.
I think changing/healing our brains being even younger is also 100% possible.
Its not easy and it takes shit ton of wilpower/dedication etc. But its f-ing worth it.