Flush Rheemglas Fury 22VR75 yearly-increase life of H2O heater?

Generally the year of manufacture for Rheem is 3rd and 4th digit of serial number. 06 is 2006, 92 is 1992 etc.
Older gas water heaters are better than new ones, and easier to keep repaired and maintained.
http://waterheatertimer.org/How-to-maintain-water-heater.html
Regardless of age, the key factor is whether tank is rusted, or rusting.
Open drain valve and check if water is rusted.
http://waterheatertimer.org/Replace-anode-rod.html

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You have 6-year 50 gallon gas water heater:
42V50 would be the newer model number. They make tall and short models.
http://www.rheem.com/product.aspx?id=CC643E03-4C15-4775-B139-E504A95651F7

All brands of water heater are good.
So any 50 gallon gas water heater from local box store or hardware is good product.
Tanks with longer warranty last longer. So 9-year and 12-year water heater will last longer, unless you have very hard water or odor in water and need to change frequently.
I recommend avoiding water heaters with electronic controls since they are not protected from power surge and can cost more to repair.

Additional resources:
http://waterheatertimer.org/How-to-install-gas-water-heater.html

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1) If tank is connected with single pipe to cold water line, then it could be expansion tank.
Add a comment with photo so I can see.
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2) Take photo to plumbing supply store.
Expansion tanks unscrew from pipe. Simply install it and it has internal pressure bladder.
Has to install on cold water line.

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Open following link to troubleshoot cause and solutions for leaking water heater:
http://waterheatertimer.org/Leaking-water-heater.html

Rusted water heater must be replaced.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

For money-saving water heater information:
http://waterheatertimer.org/Replace-anode-rod.html
http://waterheatertimer.org/9-ways-to-save-with-water-heater.html

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Also take advantage of fixya expert assistance live.
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Fixya is always less expensive than a service call.

It could be a thermocouple but first take the whole pilot assembly out and disassemble it. Clean it very good (compressed air is ok) especially the orifice inside the pilot horn. You may just have a weak pilot. If the flame is in good contact with the thermocouple and problem still exist, then change the thermocouple. I believe in doing the free things first.

You have 2 thermostats inside of those covers, little things with a dial on them, turn them with a small screwdriver, Don't go too hot or you will be scalding everybody. Hope this helps.

if your water heater is leaking from the tank, and not around any fitting, then you will need to replace the heater.
you can flush the heater, once a year is always recommended, however once every 2 years is sufficient.

scale, and deposites inside the tank will cause erosion and eventually eat through the walls of the tank. not much you can do to prevent this. the steel in the new tanks just don't last like they ued to.

Brown discoloration is evidence of a rusting or corroded steel pipe somewhere in you plumbing system. Trace the water lines back from the faucet and replace all the steel pipe.
White discoloration is minerals that separate out when the water is heated.
You can change the Anode Rod and it should help. It is not an instant fix, the rod will take a week or two to do its job.
If your water heater is still under warranty, call Rheem, they may replace the water heater free.

my top element to the hot water heater is working but my bottom element isnt there both brand new elements and im just not getting power to the bottom element but i have power to the top element is it possible that the top heats first and the bottom heats later running out of options!!!