The populations, by age groups, for the three countries Australia, UK, and the US, have very similar proportions, as can be seen from these tables.
| Population | US | Australia | ||
| Under 5 years | 21,299,656 | 6.9% | 1,461,088 | 6.5% |
| 5 to 9 years | 20,609,634 | 6.7% | 1,365,747 | 6.1% |
| 10 to 14 years | 19,973,564 | 6.5% | 1,403,778 | 6.3% |
| 15 to 19 years | 21,537,837 | 7.0% | 1,501,010 | 6.7% |
| 20 to 24 years | 21,539,559 | 7.0% | 1,649,659 | 7.4% |
| 25 to 29 years | 21,677,719 | 7.1% | 1,665,263 | 7.5% |
| 30 to 34 years | 19,888,603 | 6.5% | 1,534,043 | 6.9% |
| 35 to 39 years | 20,538,351 | 6.7% | 1,616,051 | 7.2% |
| 40 to 44 years | 20,991,605 | 6.8% | 1,552,666 | 6.9% |
| 45 to 49 years | 22,831,092 | 7.4% | 1,575,053 | 7.0% |
| 50 to 54 years | 21,761,391 | 7.1% | 1,470,376 | 6.6% |
| 55 to 59 years | 18,975,026 | 6.2% | 1,326,013 | 5.9% |
| 60 to 64 years | 15,811,923 | 5.2% | 1,212,537 | 5.4% |
| 65 to 69 years | 11,784,320 | 3.8% | 909,512 | 4.1% |
| 70 to 74 years | 9,007,747 | 2.9% | 710,444 | 3.2% |
| 75 to 79 years | 7,325,528 | 2.4% | 551,621 | 2.5% |
| 80 to 84 years | 5,822,334 | 1.9% | 439,306 | 2.0% |
| 85 to 89 years | 3,662,397 | 1.2% | 267,148 | 1.2% |
| 90 to 94 years | 1,502,263 | 0.5% | 100,828 | 0.5% |
| 95 to 99 years | 401,977 | 0.1% | 26,509 | 0.1% |
| 100 years and over | 64,024 | 0.0% | 3,746 | 0.0% |
| Total | 307,006,550 | 22,342,398 | ||
By Broad Age groups:
| USA | UK | Australia | |
| Age 0-15 | 20.16% | 18.70% | 18.94% |
| Age 16-24 | 14.03% | 12.00% | 14.10% |
| Age 24-49 | 34.50% | 34.60% | 35.55% |
| Age 50+ | 31.31% | 34.70% | 31.41% |
The UK figures currently relate only to England and Wales.
ABS 3201.0 – Population by Age and Sex, Australian States and Territories,
U.S. Census Bureau
Office for National Statistics
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