The optimal harvesting problem for a semi-linear age-dependent time-varying population system is discussed.

讨论了年龄相关的半线性时变种群系统的最优捕获控制问题。

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This paper, beginning with the general age-dependent population dynamics, discusses the well-pose of stationary solution.

本文从最一般的人口动力系统出发，讨论其稳态解的适定性。

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This paper is mainly concerned with optimal harvesting policy for three competing species with age-dependent and diffusion.

本文主要研究具有扩散和年龄结构的三种群竞争系统的最优收获策略问题。

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The decline begins at 32 and then accelerates after 35 (a pitcher's career is less age-dependent and harder to predict).

WSJ: Baseball Free Agency Dies of Neglect -- Matt Cain, Joey Votto, Andrew McCutchen, Matt Kemp Opt for Long-Term Deals

It is simply impossible for parents to claim a non-disabled dependent adult child over age 24 earning that amount of money.

FORBES: Ask the taxgirl: Medical Expenses and Income Adjustments

But another explanation could be changes in lifestyle factors which increase the risk of hormone-dependent tumours, such as women having babies at an older age, obesity after menopause and use of hormone replacement therapy.

BBC: Breast cancer biology 'changing'