They're probably wisely hanging it up and making sure their immediate families are taken care of through legitimate business holdings, union positions, etc. The writing has been on the wall for a long time now.

"...the successful annihilation of organized crime's subculture in America would rock the 'legitimate' world's foundation, which would ultimately force fundamental social changes and redistributions of wealth and power in this country. Meyer Lansky's dream was to bond the two worlds together so that one could not survive without the other." - Dan E. Moldea