Seems like I’ve been waiting forever for the Vermont Senate to undergo a demographic shift. Every two years there’s been talk of a retirement wave, but it never materializes. Senators consider stepping aside, then realize they’re indispensable. (They’re not.) And the voters rarely eject an incumbent except in cases of overt criminality (Norm McAllister) or advanced senescence (Bill Doyle).

The shift has been painfully incremental until this year, when almost one-third of all senators decided to bow out. The nine incomers are younger, five of them are women, and one is a person of color: Nader Hashim joins Kesha Ram Hinsdale and Randy Brock as the three non-white members of the upper chamber.

(The tiny Republican caucus managed to get older and no less male. Its two youngest members, Corey Parent and Joshua Terenzini, will be replaced by a couple of old white men.)

Got more numbers to plow through, but here’s the bottom line. The Senate is on the verge of a historic shift, but it’s happening in slow motion. We might reach the tipping point in two years’ time. We’re not quite there yet.

There are still plenty of tenured members in positions of power. They account for most of the committee chairs. But only — “only” — eight of the 30 senators will be 70 or older. At least 13 will be under 65, which doesn’t sound like a lot but in the Senate it definitely is.

The incoming Senate President Pro Tem, Phil Baruth, straddles the age divide. He’s only — “only” — 60. But he’s entering his sixth two-year term, so he’s familiar with the Senate and the elders are comfortable enough with him to make him their leader. As a senator he’s been a strong policy advocate unafraid to ruffle feathers, but as Pro Tem he’ll know he can’t push his caucus too far too fast.

There are the preliminiaries. Now let’s dive in.