The most likely cause in your age group of the tingling is pinched nerve in back (which can occur in the absence of backache). The other possibilites are;
1) Deficiency of vitamin B12.
Last two are not common with no other symptoms.
The tingling is usually a self resoling phenomenon. You may try following back care in activities in daily living which will help in resolving it early;
a) Avoid bending at 90 degrees
b) Pushing and pulling of heavy objects should be avoided till tingling subsides
c) Avoid prolonged sitting and standing
d) Avoid sitting or sleeping on floor
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
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