Yearly date comparison?

What is the best way to find an event with a yearly occurrence?

CREATE TABLE events (
start_date DATE,
end_date DATE,
recurring TEXT
);
INSERT INTO events (start_date, end_date, recurring) VALUES
('2010-02-28','2010-03-01','yearly');

SELECT * FROM events WHERE (start_date+'2 YEARS'::INTERVAL) >= NOW()
AND (end_date+'2 YEARS'::INTERVAL) < NOW();

Since I may not know how many years back the start/end_date is, is
there a way to just ignore the year or make it the current year,
without killing performance?