STEPS
TOOLS
Tap on settings...
Then general//accessibility...
And turn on the option "Bold Text"
You will need to restart your device after that...
Aaand... There you go now you got the old IOS text back on your device!
The creator of this guide has not included tools

How to make ios 7 text bigger (bold)

If you don't like the new look of the text on iOS 7 you can change it.