A Bosch dishwasher is expected to last from 8 to 10 years.
The actual lifespan of a Bosch dishwasher will depend on how often it's used and if it is maintained and cleaned often enough.
My mom has a Bosch dishwasher that is 11 years old and so far is working great.
She has put money aside though to replace the Bosch dishwasher when she needs too which is likely to happen in a few more years.
Cheaper brands of dishwashers usually only last 1 to 3 years before they go bad and need replaced.
I bought a cheap brand of dishwasher for my house and it quit on me within 2 years of purchase.
I then bought a good quality Bosch dishwasher and it's also still going strong after 5 years of near constant use.
I expect my own Bosch dishwasher to last another 5 years at least.