Thanks so much, i will searchWelcome to the PEB Forum!
It's maybe not as helpful, but I believe I recall @Jason Perry addressing a similar "reduction in age for Soldier medically discharged" inquiry via another PEB Forum member's post.
That said, I would suggest that you perform a search under the "Posted by member:" option for @Jason Perry to potentially locate the information you seek.
Thus, I quite often comment that "possessing well-informed knowledge is truly a powerful equalizer."
Best Wishes!