Staying effective in today's NBA is a tricky and demanding undertaking for an NBA veteran in his mid-to-late 30s or older.
We're in the middle portion of the 2012-13 regular season, and several aging stars are undergoing difficulties they didn't encounter earlier in their careers.
Not every veteran can be as brilliant as Tim Duncan, Paul Pierce and Kobe Bryant. Injuries, ineffective defense and new roles can all serve to derail an old warhorse.
A pair of Boston Celtics stars have some red flags that could be problematic come playoff time. On the other side of the country, a standout point guard is failing an important test.
What are some of the key red flags surrounding some of the NBA's veteran stars?
*Stars featured in this article are in their mid-30s (at least 34) or older.