If you really think that 50's are "elderly"you might want to consider visiting some assisted living places in the city. Not for them but you will be there much sooner than you think and it is good to plan ahead.

I can give the "elderly" lists of places that dont start until after 11pm that are full of 30's to 80's in the city that dance together till 4am..

free: sunday night So Street Seaport dancing only goes to 1am.. they might be able to handle that while you rest.