When you say "Good For Senior Citizens" - it opens a world of questions and ideology. Ocean Drive and especially the SoFi Neighborhood of Miami's South Beach is typically a "party" destination favored by many trendy and sporty types.
There are many restaurants, nightclubs and bars in SoFi. Let me not forget to mention that there are some very nice beaches and all kinds of exciting events going on there too!
Age is a state of mind - some people are young at 70 while others are old at 25.