My son started puberty early, a few months after he turned 12. Before that, his control was almost perfect, about 95% time in range. Now it’s been 6 months, and it is still getting worse. He is 135 lbs, 5’8" and has a faint dark smudge above the lip. My first son stopped growing around 16.5, so for us I think about 4-5 years of bad peaks total – but possibly it continues for longer?
What worries me a bit is this curve which I put up a few weeks ago: What is the average A1c of T1D patients: study
It shows patients’ A1Cs getting much worse starting around age 10, which matches our experience. But if you look, the curve does not become really normal until after age 25 
However, I suspect that it is more due to lack of discipline for young adults than it is due to peaks.
@drpepper68, when did you stop having significant hormone peaks?