One of my coworkers recently retired at age 60, to spend more time with his two small grandkids. They call him back about one or two days per week, so, at least at UC San Diego, "you can check out any time you like, but you can never leave." Grandparenting is indeed a great reason to retire -- best wishes on that phase of your life.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069