150th anniversary test is in March 2027. He will be 37 turning 38 by the next Ashes tour that year.
Still 13 tests before that (Afghanistan, SA, NZ and India) which is fair amount of cricket. I'm curious to know how he will go with the SA tour. He has some demons to exercise over there.
I'd say 150th test is a chance for retirement. Its not the SCG though. Some players want a send-off at their home ground. Others like AB or Clarke retired overseas. Not sure what SPD Smith would want.
Remember last summer he hinted at playing some t20 leagues when retiring from red ball. So red ball retirement isnt too far away if he still wants a year or two of playing that useless shit and giggle.
Id be very surprised he goes beyond the 150th anniversary test
Not that he or anyone would want him to, but sitting out the SA tour might not be a bad thing. Can focus on the home kiwi test and indian tour and the 150th anniversary
Problem also he isnt getting younger and not going to be as good as he has been, like Kholi may grab a good score here and there but predominately we probably see more failures. If he is killing it at 37, then will only add to his stardom which others that age havent been able to do