The specific energy usage ratings for the washer are no longer available. Based on a similar model, the washer would use about 300 Kwh per year. You can use this number to compare your washer to newer models. The electrical cost between your washer using 300 Kwh per year and a new high efficiency washer using 150 Kwh per year will only be about $15. A greater savings is realized through a reduction of water usage. You washer will use over 40 gallons of water per cycle. New front load high efficiency washers will only use 10 to 15 gallons of water per cycle. Based on a standard of 8 loads per weak, the difference in water usage could be as much as 12,000 gallons. The annual water use of your top load washer is about 16,000 gallons while a top load washer may use as little as 4000 gallons per year. If you consider the cost of heating some a portion of the higher volume of water, you can gain significant savings by using a high efficiency front load washer.
There are not energy usage ratings on dryers. All dryers use about the same amount of energy (alot). I would only consider replacing your dryer if you want to match a new washer for home interior appearance purposes. If you are having any trouble with the dryer, submit a question to us and we can usually help you with troubleshooting and repair tips.
If the washer is working properly at this time, you may want to keep using it for a while. When you do decide to replace the washer, I recommend that you consider a front load high efficiency model. A new innovation in this type of washer is the direct drive motor. This motor is attached directly to the shaft of the spin basket. This eliminates some of the vibration and dependability concerns that some front load washers have. These high efficiency models are typically more expensive than top load models similar to what you currently have. The water and energy savings usually pay off over a couple of years of use. Here is a link that describes one model of a reasonably priced front load washer with a direct drive motor:
LG White 3.6 cu. ft. Capacity Front Load Washer w/ Direct Drive Motor Energy Star
If you need more help, resubmit your question with additional details.