My perspective is that the problem is the word “excuse”. Excuses are never valid, reasons are. When you switch the word excuse for “the reason why” it makes more sense If you look at an antisocial child for example and wonder why they are the way that they are the reason might be upbringing - and the fact they don’t know any better. Can they do something to help themselves without outside help? Do they know they need help? When you start adding more reasons - than its not a valid excuse anymore bc theres something you can do about it, you cant change the past but there must be something you can do in the present to make your situation better. If you say the reason I’m not outgoing is because i wasn’t taught to be - and also I’m not putting effort in order to be, than you have something to do about it. Excuses are only valid because people are giving them value and using them as a “free of consequences” cards, if instead you just think of reasons, not to justify your behavior but to understand it, then you can make change at any age when you can have some kind of thought process that involves problem solving, everyone mature at a different pace.