template0 is having high age of datforzenxid

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.