Shoe fit

Can someone help? When I ride my Mtn bike my toes kill me. This usually only happens when riding a lot of downhill and yes, my toes nails are nicely trimmed:) My Nike shoes are about 5 years old, but look in great shape.
When I rachet the buckles down, it only cause a great deal of pain on the top of my foot. Any suppestions? New shoes needed? Thank you