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 HardWaxOil instead of a natural finish will often prevent this from happening. The colour most used for this is the "Golden Oak", either two coats or one coat Golden Oak and one, the last, coat natural HardWaxOil.
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.