8 foot or 9 foot?

Hi all,
Yet another beginner longboard question BUT! I looked thru the forum and can't find much on my size.
I'm 65 kg / 174cm, 145/5'8". Fairly athletic at 50 . Just took my first longboard lesson with my 11 year old son and we loved it. I used a 9 or 9.4 GS, son on a 7 foot GS softies. We both did well I think and got many good rides, so we're hooked. My question is: Can I get away with an 8 foot softy instead of a 9 for myself? And save a hundred clams. Or should I not be a cheapskate and just get the 9? I think because of my weight I can do the 8 foot. Would appreciate any advice . thanks!!
Yet another beginner longboard question BUT! I looked thru the forum and can't find much on my size.
I'm 65 kg / 174cm, 145/5'8". Fairly athletic at 50 . Just took my first longboard lesson with my 11 year old son and we loved it. I used a 9 or 9.4 GS, son on a 7 foot GS softies. We both did well I think and got many good rides, so we're hooked. My question is: Can I get away with an 8 foot softy instead of a 9 for myself? And save a hundred clams. Or should I not be a cheapskate and just get the 9? I think because of my weight I can do the 8 foot. Would appreciate any advice . thanks!!