Prince Philip at age 99:LONDON — The Twitter account of Britain's royal family has featured a tribute Queen Elizabeth II gave to Prince Philip for the couple's 50th wedding anniversary.An excerpt from a speech the queen made in 1997 was posted Saturday, the day after Philip died at age 99.“He has, quite simply, been my strength and stay all these years, and I, and his whole family, and this and many other countries, owe him a debt greater than he would ever claim, or we shall ever know,”