whats the timeskip again? His sis looks kinda old

I forgot but it’s been over 10 - 20 years I think, because before River became a God, pretty sure he was around 18

10 years or so has passed since then that why, his sis must be thirty something or soon to be forty

15yrs since he become a god, when we first see him as a God it already been 5yrs & when he meets his sister again its been 10yrs, so 15yrs by CH.74