Temporal Pinnacle Period

Unfortunately, I'm unfamiliar with a numerology Temporal Pinnacle period, unless I know it by another name.

The numerology pinnacle may be what you're referring to. There are four pinnacles in the normal life span, each with a number representing the energy that most affects that pinnacle.

In your case, you've been in your fourth pinnacle for the past 17 years. It's represented by the number 3.

But that might not be what you're referring to as your question implies there's one period, not cycles or a series.

Perhaps the power number is being referred to, with a different name. The power number's influence emerges about age fourty, give or take a few years, and has influence the rest of the person's life. Your power number is the number 8.