'I Only Got 1 or 2 Years Left In Me'

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The end is near for Paul Pierce ... so says the Brooklyn Nets superstar himself who tells TMZ Sports he's only got 1 or 2 years left before his NBA run is over.

Pierce was out in Calabasas this morning picking up a few cases of water -- and explained that he was trying to stay hydrated after a killer morning workout.

When asked why he was already puttin' in work ... even though the season JUST ended ... Pierce dropped this nugget on us:

"It's a long grind. It's a long grind dawg ... I only got 1 or 2 years left in me."