help with deck size [39YO]

So - the biggest kid wanted to try skateboarding, and I found my old 90s Flip Aarto board in the garage.

And I´m kinda into it again after a 25 year break. Especially after landing rolling kickflips in my second session.

The old board is a 7.75 which feels kinda narrow.

I´m confused on the board width I should get.. is 8.0 too similar, will 8.5 feel too hard to flip for a re-beginner?

There is no local shop, so I can´t really go try a bunch of things.