The failed water path
Restore the actual entry point and its connection to surrounding roofing. The stain indoors is not the repair location by itself.

Understand roof repair versus replacement in Nicoma Park, based on adjoining material, hidden layers and the extent of failure.
The useful question is whether a repair can leave a sound roof. A contained defect in workable material is different from a small visible opening surrounded by a deteriorating assembly.

Use the roof’s present condition rather than a house-age rule or an invented cost percentage.
A repair has a defined boundary.
Restore the actual entry point and its connection to surrounding roofing. The stain indoors is not the repair location by itself.
Wet or damaged material beneath the covering must be assessed. A surface patch is not a complete answer to deteriorated deck.
A local repair does not renew the rest of a worn roof or make its remaining service life predictable.
Replacement renews a larger assembly and exposes the deck for assessment. It can address several deteriorated details together, but it still needs a defined material and installation scope. Additional layers, wood damage, ventilation changes and difficult flashing can change the project. Comparing those actual scopes is more useful than assuming replacement starts at a fixed percentage of a repair bill.

No. A contained failed detail can be repaired when the adjoining roof and support are suitable.
No. Age gives context, but condition, installation, repair history and material compatibility determine the available work.
Yes. A free roof inspection can explain a repair boundary and what a larger replacement would resolve.

Tell us what you noticed and where the Nicoma Park property is.