template0 is having high age of datforzenxid

[AI Rumman]

Hi,

I am running Postgresql 10 where I can see the template0 database is having
longest datfrozenxid:
```db_name  age_of_datfrozenxid
--------------------------------------
postgres    251365
template1    234574
template0    75366462
db1    253097
db2    250649
db3    250649
db4    14641
db5    14214```

Initially I had high age for all the databases and I ran "vacuum freeze"
which brought down the age of other databases. But how can I do the same
for template0?
Please advise.

Thanks.