*I believe he was 276*
Obviously wrong. *sigh*
I know the db wiki isn't always right, and can be "corrected" by anyone and their mother, but if the timelines are to be accurate, then it says that he was born sometime in the year/age 737 and then say that at the start of Z he was 23, making that current year/age 760. He fought Raditz, died, and was brought back in a year's time, making it 761 and him 24. So for his fight with Frieza, I'm gonna say he was somewhere between 24 and 25 considering the time space between his training on the space ship from Bulma's father to the point he lands on Namek.
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Frieza does not get killed by Goku. Future Trunks is the one to kill Frieza.
Goku returned from defeating Frieza in episode 121 of season four after Trunks chopped Frieza into pieces and blasted him along with his father King Cold
Frieza 100% it is obviously shown when Frieza killed Goku. I forget which episode but when Frieza 100% was fighting ssj Goku and he killed him by drilling him into the lava and then sending energy blasts down the hole. Coincidentally, the wish to restore everyone killed by Frieza and his men, restoring Goku. Not only that but because of the saiyan's natural zenkai he got a boost in power. This allowed him to defeat Frieza since he had been damaged by ssj Goku's attacks and because of the power loss due to using 100% power.
Goku turns Super Saiyan on Episode 80: Transformed at Last. Frieza miraculously survives the blow from Goku's Spirit Bomb. Frieza kills Piccolo when he pushes Goku out of the way from Frieza's attack, thus sacrificing himself in the process. He then crushes Krillin to bits which was too unbearable for Goku to handle. Krillin is one of Goku's best friends and to have to see this unleashes a transformation in Goku. He has never felt this way before causing him to transform into a legendary Super Saiyan right before Frieza's eyes. Goku realizes that Frieza has caused far too much destruction and murdered many innocent lives. He is determined to end his reign of terror for good with his new form.
Goku survived after beating Frieza by taking Captain Ginyu's ship, which had survived the destruction of Namek. He landed in the planet of the Yardrats, and stayed there until returning to Earth.