He has been at the club for six years, but boss Billy Davies has hinted that older members of the squad will be restricted to one year contracts.
But Alexander said: "When you're 16/17 you look at the 32/33 year-olds and think they are ancient and you'll never get to that age but now that I am it seems to have flown by so quickly.
"I have enjoyed every single season that I've played and hopefully it will continue for another four or five."