Firstly, the whole 'your brain stops developing at age 25' thing is spurious anyway. The original studies that came up with this figure, they just didn't include any subjects over 25. So that's when the data... stopped.
But that doesn't really mean anything.
/2
Saying 'the brain stops developing at age 25' because you didn't study anyone older is like saying "Olympic sprinters are only capable of running for 100m".
I mean, they *clearly* can go for longer. That's just when the race ends. It's not the same thing.
/3