diff --git a/include/jemalloc/internal/hpa.h b/include/jemalloc/internal/hpa.h
index 1f90a15f..d788d051 100644
--- a/include/jemalloc/internal/hpa.h
+++ b/include/jemalloc/internal/hpa.h
@@ -31,8 +31,6 @@ struct hpa_central_s {
 	size_t eden_len;
 	/* Source for metadata. */
 	base_t *base;
-	/* Number of grow operations done on this hpa_central_t. */
-	uint64_t age_counter;
 
 	/* The HPA hooks. */
 	hpa_hooks_t hooks;
diff --git a/src/hpa.c b/src/hpa.c
index cb3f978c..932cf201 100644
--- a/src/hpa.c
+++ b/src/hpa.c
@@ -82,7 +82,6 @@ hpa_central_init(hpa_central_t *central, base_t *base, const hpa_hooks_t *hooks)
 	central->base = base;
 	central->eden = NULL;
 	central->eden_len = 0;
-	central->age_counter = 0;
 	central->hooks = *hooks;
 	return false;
 }
@@ -95,7 +94,7 @@ hpa_alloc_ps(tsdn_t *tsdn, hpa_central_t *central) {
 
 static hpdata_t *
 hpa_central_extract(tsdn_t *tsdn, hpa_central_t *central, size_t size,
-    bool *oom) {
+    uint64_t age, bool *oom) {
 	/* Don't yet support big allocations; these should get filtered out. */
 	assert(size <= HUGEPAGE);
 	/*
@@ -118,7 +117,7 @@ hpa_central_extract(tsdn_t *tsdn, hpa_central_t *central, size_t size,
 			malloc_mutex_unlock(tsdn, &central->grow_mtx);
 			return NULL;
 		}
-		hpdata_init(ps, central->eden, central->age_counter++);
+		hpdata_init(ps, central->eden, age);
 		central->eden = NULL;
 		central->eden_len = 0;
 		malloc_mutex_unlock(tsdn, &central->grow_mtx);
@@ -168,7 +167,7 @@ hpa_central_extract(tsdn_t *tsdn, hpa_central_t *central, size_t size,
 	assert(central->eden_len % HUGEPAGE == 0);
 	assert(HUGEPAGE_ADDR2BASE(central->eden) == central->eden);
 
-	hpdata_init(ps, central->eden, central->age_counter++);
+	hpdata_init(ps, central->eden, age);
 
 	char *eden_char = (char *)central->eden;
 	eden_char += HUGEPAGE;
@@ -738,7 +737,8 @@ hpa_alloc_batch_psset(tsdn_t *tsdn, hpa_shard_t *shard, size_t size,
 	 * deallocations (and allocations of smaller sizes) may still succeed
 	 * while we're doing this potentially expensive system call.
 	 */
-	hpdata_t *ps = hpa_central_extract(tsdn, shard->central, size, &oom);
+	hpdata_t *ps = hpa_central_extract(tsdn, shard->central, size,
+	    shard->age_counter++, &oom);
 	if (ps == NULL) {
 		malloc_mutex_unlock(tsdn, &shard->grow_mtx);
 		return nsuccess;