Out of that post you picked the example of the length of career to post about? I wasn't trying to give an accurate example of the length of NBA careers, I was trying to point out how you don't get that first year of free agency and potential big money back.
With Parker we are talking a potential top 3 pick though and his career should at least go until 35 unless he has an injury.
Just for fun I looked up the 99 draft to see who was still in the league: Brand, Odom, Hamilton, Miller, Marion, Terry, Maggette, Artest, and Kirilenko. Not bad. More than I actually would have thought.