That’s simply not true. Around 26 your brain finally settles and it’s hard to turn fully around. Until then, therapy can be extremely useful because your personality is not 100% formed.

Afterwards therapy can still be very useful because therapists are trained to help you and they know how and they can help you live a better life. Obviously, the younger you are the better, but it’s better to start at 60 than not at all.

Therapy can help at any age. Not sure what “one week of freedom” are you talking about, but your life can literally get better overall.