喜寿 is read as きじゅ (kiju) and means 77th birthday.
きじゅ
kiju
きどあいらく
human emotions (joy, anger, grief and pleasure)
きぼうほう
Cape of Good Hope
えびす
Ebisu
てんじゅ
natural span of life
ちょうじゅ
long life
ことぶき
longevity
べいじゅ
88th birthday
はくじゅ
99th birthday
ふくじゅ
long life and happiness
しんねんのことぶき
New Years greetings
ふろうちょうじゅ
perpetual youth and longevity
なんざんのじゅ