Time to buy a new washer/dryer?

We have a Kenmore washer and Dryer. They are 47 yrs old. I have replaced the belt on the washer 3 times. Never touched the dryer. Today's products do not have the endurance the old ones did mainly because of the simplicity of construction and moving parts. If you're going to keep them then get a repairman to realign the dryer drum to eliminate the waring out of rollers and check out the washer although I don't know why there would be scorch marks on fabric as there isn't any heat involved other than the water (could be grease/oil from the agitator shaft). The wheel waring out on one side sounds like it isn't turning and the drum wares a gouge in it from the friction of the drum rubbing on it as it turns. Repair people don't gouge you if you use a well known company or someone you trust. On the other side, today's washers and dryers are much more energy efficient and environmentally friendly. Use less water and detergent and less electricity. Can be set to start during non peak power usage times. You' also have to consider that you may end up putting more money in the old ones than the cost of new ones. So which will be cheaper in the long run?