Tony Hawk Hits Insane 900 Trick ... At 48 Years Old!!

Here is video of 48-year-old Tony Hawk stickin' it right to Father Time.

Exactly 17 years after pulling off a then impossible 900 trick at the 1999 X Games ... the skate legend got back on his board on Monday and did it AGAIN!!!

Don't get it twisted, Hawk didn't just get on the ramp and nail it on his first try -- he bailed HARD several times (and smashed his head in the process) before landing the trick.

You gotta watch the video and appreciate Hawk's sheer determination -- it's crazy inspirational.