Green MP Chloe Swarbrick breaks out "OK Boomer in the house". Her comment stoked a new round of commentary on the Boomer v Millennial generational divide.

ANALYSIS: Green MP Chloe Swarbrick's "OK boomer" line in Parliament this week - indicating youthful irritation with elderly intransigence - confuses the reality that the most powerful generation in Parliament is Generation X.

An attempt to sort the 120 MPs into their generational cohorts indicates more than half are from Gen-X, while only about a third are from the older Baby Boomers.

Swarbrick is one of the 15 MPs from the youngest age sector in Parliament, the Millennials. Winston Peters is technically marginally too old to be a boomer, but that would put him into the so-called Silent generation, so in his case boomer would seem to be appropriate.

CHRIS MCKEEN/STUFF 1 Chloe Swarbrick, 25, is the youngest MP, and one of 15 Millennials in Parliament.

Of course, it's all a bit arbitrary, and there's an added complication that three of the five MPs whose birth dates we don't have are on the boomer/Gen-X cusp.

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Despite that, the general picture is clear: Gen-X dominates Parliament, and includes Prime Minister Jacinda Ardern - the youngest of the cohort in Parliament - and National leader Simon Bridges.

ROSS GIBLIN/STUFF Prime Minister Jacinda Ardern is the youngest MP from Generation-X, which accounts for more than half of all MPs.

For the purposes of this count, we've used common definitions of the cohorts:

- Baby Boomers, born 1946-1964

- Generation X, born 1965-1980

- Millennials, born 1981-1996.

The group born since 1997 is commonly referred to as Generation Z. No one from that age group is in Parliament.

Our count shows 66 Gen-X MPs and 38 boomers. It's possible one or two of the Gen-Xers could be boomers, and Peters isn't included in the boomer group.

MONIQUE FORD / STUFF Deputy Prime Minister Winston Peters is the oldest MP and - by some definitions, at least - a member of the Silent generation.

Regardless, more than half of Parliament are members of Gen-X. Does that mean anything?

Despite the Greens' youthful reputation, and Swarbrick's frustration with some of her older colleagues, National has the most Millennial MPs with six, while the Greens and Labour each have three.

Labour has 31 MPs in the Gen-X cohort, a few ahead of National, while National rules the boomers with 23 MPs - give or take - in that cohort.

Another question might be whether any patterns can be identified in the way the generational cohorts vote on conscience issues.

Looking at the second reading of the End of Life Choice bill, dealing with euthanasia, which passed by 70-50 in June. Eleven Millennials were in favour, and four against, among Gen-X MPs there was a roughly 8-to-5 ratio in support of the bill, while among boomers opponents were slightly ahead of supporters.

In August, the first reading of the Government's bill decriminalising abortion passed 94-23. Only two Millennials opposed it, along with 13 from the Gen-X cohort, and eight Baby Boomers. One Millennial didn't vote and nor did two boomers.

It's not much to go on. Maybe you could say that support for euthanasia faded with age. And that's maybe about it.