The manga was just getting interesting with Goten’s new personality too and closing-in on end of DragonBall era and then…
But obviously there’s bigger more horrendous thing that happened.
You are worse than me lol. You are living one miserable life (so am I) but you are living Stockholm syndrome or BDSM (some hate fetish) or some sheeet.
If Gohan rounded-up his age at introduction (so Goku can be 23 years & 2 months) then:
Introduction - 3 years & 8-8.5 months
vs Vegeta & Nappa - 4 years & 6.8-7.3 months or 4 years & 7.12-7.62 months
when Goku arrived on Namek - 4 years & 8.47-8.97 months or 4 years & 8.79-9.29 months
When...
I have no idea, which is why I kept Tenshinhan & Chaozu & them out. I don’t think they are ever given specific age in manga. Going by how he looks you can assume he’s around Yamcha’s age, maybe a year older. Vegeta’s age I got off the Bardock TV-special where he looks like a 5-year-old when Goku...
Yet, AT kept talking about the 70% later too (FnF, even-though that was before DB-Super). Just accept it as getting retconned or Bills straight-up lying & call it a day for that.