Do you have full plots for your OC's (Repost)

I've seen people saying they have their characters at different points in a plot, (eg. Aged 15 at start and 20 at end)

So I beg the question, do you have full storied in your mind for your OC's?

BTW the fact that my original post got taken down for "low effort" is so dumb, It's a GENUINE QUESTION I've had for ages.