If you created the db with restore database command... you can check the last backup inforamtion info in task pad...or by running the query in msdb...
select top 1 * from msdb..backupset
where database_name = 'db name'
order by backup_finish_date desc
select top 1 * from msdb..restorehistory
where destination_database_name = 'db name'
If you created the db by attaching the files using the sp_attachdb then check the mdf and ldf files created date.
Microsoft SQL Server MVP