Appliance Manufacture Dates

Can anyone assist me in determing age of these two appliances?

Amana Commercial Quality Washer
Model No. LWA50AW

Serial No. 9803043233

Maytag Special Edition Super Capacity Dryer
Model No. MDG9420BWW

Serial No. 10705143WZ

Many thanks for any assistance.

1998 and 1999 respectively