Most bike seats that the folks on this forum use are "hard." I don't know if your bike seat is especially hard due to age, or if it has always been that way.

The reason for a hard seat is that, on longer rides, you want your weight supported on your "sit bones" - your ischial (sp?) tuberosities. You don't want a lot of flesh in contact with a seat, as it will rub and cause sores, etc.

For shorter rides, it likely makes little difference.

Sometimes finding a seat that you like and fits you takes some time and effort.