template1 database is facing high datfrozenxid

Hi,

I am running Postgresql 9.1 and I can see the datfrozenxid is going high
and vacuum process is not bringing it down. And this has been happening on
template1 database.

2016-02-12 16:51:50.400 CST [19445][(at)] : [13-1] WARNING: oldest xmin is
> far in the past
> 2016-02-12 16:51:50.400 CST [19445][(at)] : [14-1] HINT: Close open
> transactions soon to avoid wraparound problems.
> 2016-02-12 16:51:50.400 CST [19445][(at)] : [15-1] LOG: automatic vacuum of
> table "template1.pg_catalog.pg_database": index scans: 0
> pages: 0 removed, 1 remain
> tuples: 0 removed, 9 remain
> system usage: CPU 0.00s/0.00u sec elapsed 0.00 sec
> 2016-02-12 16:51:50.411 CST [19435][(at)] : [82-1] WARNING: oldest xmin is
> far in the past
> 2016-02-12 16:51:50.411 CST [19435][(at)] : [83-1] HINT: Close open
> transactions soon to avoid wraparound problems.
> 2016-02-12 16:51:50.411 CST [19435][(at)] : [84-1] LOG: automatic vacuum of
> table "template1.pg_catalog.pg_largeobject": index scans: 0
> pages: 0 removed, 0 remain
> tuples: 0 removed, 0 remain
> system usage: CPU 0.00s/0.00u sec elapsed 0.00 sec

I vacuum database manually but nothing is working out.
Please help,

Thanks.