Totally up to the individual.
My parents divorced(very messy) when I was 16/17 , best thing they ever did for us kids.
I was with hubby 5 years to the day before we tied the knot, must say we are as happy and as much in love as ever, after all these decades together I reckon the love just gets deeper. The secret is not to rush into it, hubby was my 5th proposal, thank goodness I was picky