There are two different types of floorboards: softwood and hardwood. Pine boards are the most frequently found in 'modern' homes. You can of course re-sand them, but that won't reduce the ease with which dents and small damages appear.
If you accept this 'softwood' fact then there's nothing to stop your re-sanding the old existing pine boards in your home.
There is however one more thing to be aware of: where Oak matures into its characteristic Honey Colour, Pine tends to mature into orange - sometimes quite ugly orange too!
Applying a coloured Oil instead of a natural finish will often prevent this from happening. The colour most used for this is the "Colour Wax Oak", either one or two coats. always followed by a last coat natural HardWaxOil. For your conveniences we've already paired the two products together as "Restoration Pack Pine"
So instead of a nicely restored, but turning orange quit quickly, floor you end up with a nicely restored 'golden' brown floor - which could give you years and years of value. Do remember to apply a suitable maintenance product to it once every 5 - 6 months to keep your floor healthy and beautiful.