How long does white wine last after opening?

I started researching this question again today , as I happened to find a bottle of Fox Den

1991 private reserve 'Temecula Chenin Blanc' in our bar. It was most likely purchased by my mom back around that time. She passed away that same year.

I was wary of opening it, to say the least. Nearly 20 years gone by. But, hey it doesn't hurt to have a sniff. It looked OK, nice golden color. So...open I it did. Guess what??? It smells great!! sip, sip. Wow, it tastes great! Best white wine I've had in years.

So...there ya have it. Maybe not all wines keep this well, but this one is sensational. Cya....Gotta go refill my glass.