Hey,

Yes your graduate degree is valid to apply in DU pg.  For admissions to postgraduate programmes, the candidates must have completed bachelor’s level programme from any recognized university. The minimum percentage of marks required may vary depending upon the programmes. There is no minimum age criteria for admission in postgraduate courses offered by the affiliated colleges of the university, except in courses where MCI (Medical Council of India), AICTE (All India Council of Technical Education), BCI (Bar Council of India) have prescribed the minimum age required.

You can go through the link below to get a detailed analysis of the same-

https://university.careers360.com/articles/du-pg-admission

Hope this helps.