How often do commercial aircraft go in for maintenance?

Fortunately, the life span and regular maintenance/upgrades of commercial aircraft are strictly regulated. On average, they get replaced every 22.8 years, according to Statistica. But there are many factors to consider around their retirement, not to mention what happens to them after they’re put out to pasture. In the past 10 years, aircraft were replaced more frequently than they had to be because fuel prices went up, so aircraft were replaced with more fuel-efficient models.