If you want to write a memoir about a certain time in your life, is there a time when it would be too late?

Don't ask me why I've been holding off on it (don't know how to start, my executive function disorder, etc), but I've really had this strong idea in my mind to start a memoir about a specific time in my life.

The catch is - I'm now just about fifteen or so years separated from that time (2010-ish).

You don't have to worry about me forgetting stuff regarding those days though. Besides thinking about it all the time I also continously jot notes down regarding the event.

Apologies about keeping my post vague, by the way.