# Tailoring Liver Transplant Decisions: How Donor–Recipient Age Matching Influences Outcomes

## TL;DR

This study identifies how donor and recipient age matching affects liver transplant outcomes, finding specific age thresholds that increase risk for different recipient age groups.

## Contribution

The study is the first to define national, age-specific donor age thresholds associated with increased liver transplant risk.

## Key findings

- Donor age ≥50 years is linked to a sixfold increase in mortality for pediatric liver transplant recipients.
- For young adult recipients (18.1–30 years), donors over 55 years old are associated with higher mortality and graft loss.
- Donor age is not significantly associated with outcomes for recipients aged 65 years or older.

## Abstract

Donor age is a key determinant of liver transplant (LT) outcomes, but its impact varies across recipient age groups. Specific donor age thresholds associated with excess risk remain undefined.

Using data from the Scientific Registry of Transplant Recipients (2011–2021; follow‐up through 2024), we analyzed first‐time, single‐organ LT recipients. Donors and recipients were stratified by age. Outcomes included patient, graft, and death‐censored graft survival. Multivariable Cox regression models adjusted for liver disease severity, comorbidities, graft type, and transplant year were used to identify donor age thresholds associated with increased risk in each recipient age group.

Among 70 078 recipients (median age, 57 years), mean donor age rose from 39.6 to 40.9 years (p =  .004), while recipient age increased from 50.7 to 51.9 years (p =  .003). Donor age ≥50 years was associated with a sixfold increase in mortality in pediatric recipients (aHR, 6.48; 95% CI, 1.92–21.83; p =  .003). For adults aged 18.1–30 years, excess mortality and graft loss were observed with donors >55 years (aHRs >2.5). In recipients aged 40.1–60 years, risk increased progressively with donor age. Among recipients ≥65 years, donor age was not significantly associated with outcomes. These thresholds were consistent across outcomes and robust in sensitivity analyses.

This is the first national study to define recipient age‐specific donor age thresholds associated with post‐LT risk. These findings support the development of age‐informed allocation strategies and call for a reassessment of organ discard practices as donor and recipient ages continue to rise.