"decline in ability" is grammatically correct and can be used in written English.
It refers to a decrease or reduction in one's skill or competence. It is often used in situations where someone's ability to do something has decreased over time. Example: The athlete's decline in ability was evident in his performance on the field.
"In the typical job -- especially in the service economy where people aren't constrained by their muscles -- we do not see a decline in ability at age 65".
A recent trend puts more value in games that target the underlying problem the decline in ability to remember and react as people age.
In addition to associations with continuously measured decline in ability, higher baseline peptide levels also predicted increased risk of conversion from normal cognitive functioning to suspected MCI.
Previous research discovered a decline in ability to perform ADL among individuals with heart failure during the first year after AMI [ 18].
Huntington's disease is an inherited neurodegenerative disease that causes motor, cognitive and psychiatric impairment, including an early decline in ability to recognize emotional states in others.
There are concerns that admitting to a decline in ability and self-regulation, may become "red flags" and penalize them, resulting in loss of their driver's license.
The result is widespread damage to certain parts of the brain and a decline in abilities affected by those brain regions.
Senescence, or a decline in abilities, signals advancing age in mammals but is not a general occurrence in the animal kingdom.
Now, the Center for Retirement Research at Boston College has created an intriguing index rating 954 occupations on how susceptible performance of each is to age-related declines in ability.
So growing older does not mean an automatic decline in mental abilities, creative abilities or physical abilities.
