backend> select oid, relname, age(relfrozenxid) from pg_class order by age(relfrozenxid) desc limit 5;
1: oid (typeid = 26, len = 4, typmod = -1, byval = t)
2: relname (typeid = 19, len = 64, typmod = -1, byval = f)
3: age (typeid = 23, len = 4, typmod = -1, byval = t)
----
1: oid = "11654" (typeid = 26, len = 4, typmod = -1, byval = t)
2: relname = "pg_roles" (typeid = 19, len = 64, typmod = -1, byval = f)
3: age = "2147483647" (typeid = 23, len = 4, typmod = -1, byval = t)
----
1: oid = "11718" (typeid = 26, len = 4, typmod = -1, byval = t)
2: relname = "pg_settings" (typeid = 19, len = 64, typmod = -1, byval = f)
3: age = "2147483647" (typeid = 23, len = 4, typmod = -1, byval = t)
----
1: oid = "11723" (typeid = 26, len = 4, typmod = -1, byval = t)
2: relname = "pg_file_settings" (typeid = 19, len = 64, typmod = -1, byval = f)
3: age = "2147483647" (typeid = 23, len = 4, typmod = -1, byval = t)
----
1: oid = "11732" (typeid = 26, len = 4, typmod = -1, byval = t)
2: relname = "pg_config" (typeid = 19, len = 64, typmod = -1, byval = f)
3: age = "2147483647" (typeid = 23, len = 4, typmod = -1, byval = t)
----
1: oid = "11658" (typeid = 26, len = 4, typmod = -1, byval = t)
2: relname = "pg_shadow" (typeid = 19, len = 64, typmod = -1, byval = f)
3: age = "2147483647" (typeid = 23, len = 4, typmod = -1, byval = t)
----