Does aging increase obstructive sleep-apnea vulnerability?

Aging is associated with greater susceptibility to obstructive sleep apnea (OSA), principally through deterioration in upper-airway mechanical stability rather than a clearly established loss of ventilatory reserve.

Upper-airway physiology

• Physiologic testing found that reflex genioglossus activation in response to negative pharyngeal pressure declines with age (r = −0.55, P < .005). Reduced recruitment of this key upper-airway dilator would limit compensation for an airway that is narrowing during sleep.
• This mechanism is clinically relevant because weaker dilator responsiveness is linked to higher pharyngeal resistance and collapsibility—conditions that favor recurrent obstructive events.
• Sleep and endotyping studies further indicate that pharyngeal collapsibility worsens with age, including associations independent of BMI and sex. Thus, age-related airway collapsibility is a well-supported pathway to OSA vulnerability.

Ventilatory-control considerations

• Healthy older adults have shown a narrower CO₂ reserve, consistent with altered ventilatory-control reserve. This could theoretically impair compensatory ventilatory drive and recruitment of airway dilator muscles during obstructive events.
• However, a narrow CO₂ reserve is more directly relevant to central-apnea physiology. OSA-specific studies do not show a consistent age-related direction for loop gain: a large cross-sectional study reported higher loop gain with age in both sexes, while a small physiologic OSA study found lower loop gain in older adults.
• Airway collapsibility, rather than ventilatory-control instability, therefore appears to be the more credible age-related OSA mechanism.

Bottom line

• For an 83-year-old man, aging plausibly contributes to OSA vulnerability, with the strongest support for increased upper-airway collapsibility and reduced dilator-muscle responsiveness. Diminished ventilatory reserve may contribute, but should be regarded as a secondary, uncertain OSA-specific mechanism rather than an established primary cause.