Manny Pacquiao says he wants to fight until he's 45 years old ... and when he retires, the boxing star tells TMZ Sports he will seriously consider buying an NBA franchise.
The 40-year-old superstar has made a FORTUNE during his boxing career -- and says he feels he's got AT LEAST another 5 years of fighting before hangin' 'em up for good.
"I feel like young, like late 20s," PacMan says ... explaining that he still loves the sport and all of the training that comes with it.
Pacquiao -- who's fighting undefeated star Keith Thurman on Saturday -- tells us he feels blessed by God .