Lifetime starter

Hello, one of you has a plan, how long a starter would have to hold. Mine is now “dead” after almost 5 years and 93000 km from today to tomorrow. (no more sugar) The “dead” of my starter ́s announced itself for about 1 year, because he sometimes jerked and sometimes even went out again at the first start, but then at the second time perfectly sprang up. Have read in the BMW Formum something of 1 million start operations. If I base 5 years and in the schni tt 4 start operations/day I can’t even get to 10000 start operations. Does anyone have any idea how to get a specification, how many starters are designed for? Will soon also write a nice letter to the Fiat customer service. Ciao FrankyNue