Why is it der Advantage?

Advantage ends in -age. Most nouns with this ending are feminine (90% take die), but Advantage is an exception: der Advantage.

The other -age exceptions
Sense 1
der

Meaning

[1] Sport, tennis: score after a point that was achieved after a debut (40:40)

[1] Sport, Tennis: Spielstand nach einem Punkt, der nach einem Einstand (40:40) erzielt wurde

Examples

[1] He was angry because he had drowned his advantage

[1] Er war sauer, weil er seinen Advantage verbockt hatte.

Declension

1 Singular Plural
Nominativ der Advantage die Advantages
Genitiv des Advantages der Advantages
Dativ dem Advantage den Advantages
Akkusativ den Advantage die Advantages

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary