Why I have to replace the axle & cv boot only have 74,000 mi city no accidents

What is your question?

I have 74,000 miles on a 2013 Lexus ES 350. Had to replace axle & Cv boot. Don't drive car everyday. Most highway miles. I have another car for city driving. Is it typical to replace an axle with this amount of miles? Car has never been in an accident nor rough driving