Oracle SQL Where子句用于查找30天以上的日期记录

I want to find records in a (Oracle SQL) table using the creation date field where records are older than 30 days. It would be nice to find records using a operators like > but if anyone can suggest quick SQL where clause statement to find records older than 30 days that would be nice. Please suggest Oracle syntax as that is what I am using.I want to find records in a (Oracle SQL) table