Dempografix,

This graph from the ABS shows the age distribution of the population as of 2010. The Baby Boomers at that time, using your definition, would be 46 to 64.

http://www.abs.gov.au/ausstats/abs@.nsf/mf/3201.0

Divergence
Wow, look at theat pyramid. It tells so much looking at only 20 years.
Kids decreasing, elderly increasing
Half as many over the age of 85 as kids 0 to 4. Wow!

The chart above the pyramid shows the boomers better....

Boomers 1946 to 1964 (18 years)
Gen X & Y 1965 to 1985 (20 years)
Generation i 1986 to 2008 (22 years)
http://www.abs.gov.au/AUSSTATS/abs@.nsf/lookup/4914.0.55.001Main%20Features5May%202009#defgen

Graphs and images in this document will give a good insight...
http://www.apa.org.au/upload/2002-2A_Parr.pdf

Generations information and links
http://www.esds1.pt/site/images/stories/isacosta/secondary_pages/10º_block1/Generations%20Chart.pdf

And so many govts are working to boost fertility, not reduce it.....

http://www.scribd.com/doc/27999012/Generations-defined

Dempografix,

Which generation is biggest obviously depends on which intervals you assign to which generation. If they are all equal 18 year (say) intervals, then Mark O'Connor is clearly right, as from the age distribution chart I linked to, the 5-year age classes between 50 and 65 are clearly smaller than those between 20 and 50. The smaller age classes under 20 are a sign that demographic momentum is finally playing out.

Countries are trying to boost fertility for two reasons, one well founded. Some countries have very low fertility rates, below 1.5, which does have the potentional to be very disruptive and will make it difficult to finally stabilise. In other cases, such as our own, the politicians are simply serving the interests of the 1%. More people mean a higher total GNP, which is what they care about, even if there is no improvement in per capita GNP. A bigger population also undercuts the bargaining power of labour and gives the corporations bigger domestic markets, as well as handsome profits from ownership of real estate for housing and other vital resources.

Sing a song of statistics,
A pocket full of lies.
Four and twenty blackbirds,
Baked in 4 pies.
When the pies were opened,
The birds began to sing;
Wasn't that a dainty dish,
To set before the king?

The king was in his counting house,
Counting out his money;
The queen was in the parlour,
Eating bread and honey.

The maid was in the garden,
Hanging out the clothes;
When down came a black GFC bird
And pecked off her nose.

There were 1 billion people added globally in the last 12 years. Whether people hide their heads in statistics or sand, there will be 1 billion more added in the next 10 years despite all the demographic distributions indicating otherwise. So many countries with zero replacement fertilities and still the overpopulation and overcompetition for global resources is reaching a crescendo.

REALITY, ie. Wars and economic collapses will make demographic statistics and AGW theory and all other excuses for continuing an OLIGARCHICAL infinite growth on a finite planet unsubstantial & in FACT plain idiotic.

This is why Jenny Goldie is right. Doing small adjustments to Australia's population growth now will save a lot of pain and loss of lives in the turmoil of the next decade.