Expected service life: the period a product or machine is expected to function under normal use. It expresses the lifespan of equipment or appliances and can be defined legally or for accounting.
この洗濯機の耐用年数は約10年とされている。
The expected service life of this washing machine is about 10 years.
税法上の耐用年数に基づいて減価償却を計算する。
Depreciation is calculated based on the tax code's prescribed service life.
耐用年数が過ぎた機器は安全上の理由で更新を検討した方がいい。
It's advisable to consider replacing equipment that has exceeded its service life for safety reasons.