I remember very well in the 70-80s that John Wooters repeatedly said, "once a spike always a spike". I didn't know one way or the other at the time but I've come to know that is NOT always right.
A very young buck may be a spike for his first - short - set but they are not forever a spike.
OTOH, I have killed much larger bucks, 2 1/2, 3 1/2 yo that were STILL spikes. So SOMETIMES a spike will always be a spike but NOT always.
It's also my opinion from 40+ years of deer hunting, that a 1 1/2 or 2 1/2 yo spike will NOT become a "trophy" or very large racked buck.
Jerry
