My DW and I are a couple years or so older than you, and we found plenty to do on the Solstice as well as other Celebrity ships.
On our last Soltice cruise we were usually in the sky lounge till 2AM or so.
Carnival Liberty New Year's Eve 2007
Liberty of the Seas 5/2008+11/2009
Allure 1/16/ 2011
Vision OTS 2-14-2015
Freedom OTS 3/6/16