private static boolean isOldEnoughForMerge(final NormalizerConfiguration normalizerConfiguration,
    final NormalizeContext ctx, final RegionInfo regionInfo) {
    final Instant currentTime = Instant.ofEpochMilli(EnvironmentEdgeManager.currentTime());
    final Instant regionCreateTime = Instant.ofEpochMilli(regionInfo.getRegionId());
    return currentTime
      .isAfter(regionCreateTime.plus(normalizerConfiguration.getMergeMinRegionAge(ctx)));
  }
Return {@code true} when {@code regionInfo} has a creation date that is old enough to be
considered for a merge operation, {@code false} otherwise.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/normalizer/SimpleRegionNormalizer.java