"age boundaries" is correct and can be used in written English.
You can use it when referring to the different ages at which someone can do something, such as being able to legally vote or purchase alcohol. For example, "In the United States, the age boundaries for voting are 18 years old."
It is art to some and science to others, and knows no age boundaries.
Age boundaries are drawn for mainly political reasons, not scientific ones.
Is their embrace of mainstream pop music a symptom of the same disintegration of age boundaries the Rolling Stones enacted at Glastonbury?
Despite the name and the initial emphasis on championing the elderly, as conceived by Miss Kuhn the organization knew no age boundaries.
And cooing that she just likes eating children, Kate Duchêne's witch suggests a Mrs. Lovett for the pre-teen brigade: Cannibalism, it seems, knows no age boundaries.
The rash of accident avoidance technologies — like blind spot detection, lane departure warning and adaptive cruise control (which slows your vehicle down if you get too close to another car) — cross age boundaries in their appeal.
The rise in the incidence of diabetes has broken the age limit boundaries and is currently seen in all age groups.
Wherever the MACR is set, authorities tend to use their discretion with young people close to the age boundary, explains Tim Bateman, a reader in youth justice at the University of Bedfordshire, who is involved with the NAYJ campaign.
The differences between the less evolved Nd isotopic compositions of the Narsajuaq arc of Ungava Peninsula and the highly evolved Nd isotopic compositions of the Narsajuaq arc rocks on Baffin Island may explained by: (i) subduction beneath a northward-thickening Archean cratonic block; or (ii) by a relict north south age boundary in the Archean cratonic margin.
If policies aimed at raising the retirement age will be effective, the upper age boundary of 65 should be raised.
I don't imagine that the Germans with an age boundary of 14 are less bothered about the sexual abuse of children than we are.
