耐用 たいよう年数 ねんすうじゃなかったです
taiyōnensūjanakattadesu

Noun
Desu Copula

The polite, past negative form of 耐用年数

1. Wasn't durable.; Wasn't long-lasting.; Wasn't the lifespan.

Past/Perfective
Negative
Polite
Casual Register