how long can I keep my wines

[Bruins]

Hi,

some years ago, I visited Napa Valley, California.
During that trip, I purchased three bottles of wine.

1) Cabernet Sauvignon 1996. Produced and bottled by V. Sattui Winery
2) Frcscolina 1998. Central Coast Tocai Friulano. Bottled by Viansa Winery
3) Electra 1998. a California Orange Muscat. Produced and bottled by A. Quady Winery

my question is are these 3 bottles of wine can be keep for long time? the longer the better? or are they already expired?

thank you very much for your time.

best regards,

Bruins