Everyone is different.
For example: Me.
By the time I was andibabe's age, I'd already had an ongoing BD relationship for nearly two years.
By the time I was 21, I had been in two kink relationships; one BD, the other fully BDSM.
By the time I met FF at age 25, I had not been in another BDSM relationship, except for maybe casual play, that I can think of (my brain's going; that age thing, you know?)
The reason for that wasn't because I couldn't find a DS partner, it was just that I'd started exploring other aspects of my life and was in a mostly vanilla relationship.
Now, I have been in a long-standing DS relationship for the last five years. By most peoples' standards in the BDSM/fetish/kink community, I am still considered to a be "young dominant" because of my age. It seems like most in the community don't respect dominants unless they're 45 or older. Don't ask me why.
However, despite my age, I have been practicing and researching BDSM tips, tricks, and techniques for fifteen years. I have spent more time in and around the BDSM lifestyle than most of those 45 year old guys that seem to get so much respect and adolation for their experience and opinions.
So, I wholeheartedly agree that everyone is different, especially their experience.