BERLIN (Reuters) - A 65-year-old German grandmother gave birth to quadruplets at a Berlin hospital this week, with the three boys and a girl born prematurely at 26 weeks being in good health and having a good chance of survival, German TV network RTL reported on Saturday.

The network, which had covered the pregnancy, said Annegret Raunigk already had 13 children and seven grandchildren. The announcement of her pregnancy last month had sparked a public debate in Germany about its merits.

Raunigk, an English and Russian teacher in Berlin, had received fertility treatment in Ukraine and is the oldest woman in the world to have had quadruplets, RTL said, although other women of her age and older have given birth.

The four babies, born by Caesarean section on May 19, weighed between 655 grams an 960 grams.

(Reporting by Erik Kirschbaum; Editing by David Holmes)