age hardening

例句：

1. 1.As people age, their physical abilities decline.
   随着人们年龄的增长，他们的体力会下降。
2. 2.The aging process is inevitable for all living things.
   所有生物都无法避免衰老的过程。
3. 3. The aging process can be accelerated by certain lifestyle choices.
   某些生活方式的选择可以加速老化过程。