trentaine

/tʁɑ̃.tɛn/
1.
nounfeminineSing

about thirty

roughly thirty (items or people)

Il y avait une trentaine de personnes à la soirée.

There were about thirty people at the party.

Synonyms:environ trente, quelque trente
2.
nounfeminineSing

the thirties (age range, i.e., being between about 30 and 39)

Elle approche de la trentaine.

She is approaching her thirties.

Synonyms:la trentaine d'années, dans la trentaine
trentaine - French Definition & Examples