I use solar glasses but never used reading glasses. so which number helps as reading glasses +1 or different? does it go with age ? i will be 38 soon

Depends upon age: The need for reading glasses starts in the late 30s and increases throughout the 40s until the early 50s. The power needed will increase over this time, but + 1.00 is a good starting point and should work at your age. As you age, the power every several years will need to be adjusted but typically ends at +3.00 or so.

Reading glasses: It is best you be evaluated by an optometrist ( like at Lenscrafters, Hour eyes ) so that you can get an accurate assessment of your ocular needs.