The phrase "a key age" is correct and usable in written English.
It can be used to refer to a significant or crucial period in someone's life or development.
Example: "Adolescence is often considered a key age for personal growth and identity formation."
Alternatives: "a crucial stage" or "a pivotal period".
The recent changes in the ADA criteria for the diagnosis of diabetes [ 3] contribute to the importance of recognising any variation pertaining to HbA1c levels, especially in those aged 7 years and older, as this is a key age interval for the diagnosis of type 1 diabetes mellitus in paediatric population.
But how do you recover from the trauma of going through that at such a key age?
I remember being about two and a half and hearing a dinner party of my parents going on – ha ha ha! – and thinking to myself: why am I up here in this room, bored to sobs?" He has a theory that some people are born at a "key age".
Stratification sampling was also performed, with a key age group of 18 30 years of age.
Young adulthood is a key age to develop and maintain healthy behaviors, as for example overweight in youth tends to follow into adulthood [ 1, 21].
A decision to change the funding model for aged care which has allowed the government to save $1.2bn is a "Band-Aid over a broken system", according to a key aged-care group.
Because of this consistent association between higher plasma IL-6 and adverse health outcomes, IL-6 was named "the gerontologist's cytokine" by William Ershler, who speculated that this cytokine regulates a key aging pathway in man[39].
While the involvement of additional TGF-β family members (or other age-dependent cytokines involved with muscle repair decline) is certainly not ruled out, TGF-β1 was identified here as a key, age-related inhibitor of myogenic responses.
Exploring the secretome of hESCs as a more convenient and translational approach than young blood, a key age-specific role of MAPK has been uncovered; and several novel FGFs have been identified for their pro-regenerative activity on old tissue stem cells in part, by activating the Delta/Notch pathway, and this is conserved between mice and humans [ 13, 89].
Notch activation is a key age-specific determinant of satellite cell and myoblast proliferation, and the expression of constitutively active Notch-1 enhances the proliferation of a variety of myogenic cells and delays their differentiation into myofibers during normal adult myogenesis by antagonism with Wnt [ 3- 5].
Evidence also accumulates that mTOR is a key aging factor.
