There are several associations that caters to the elderly. In particular, those that are formed for people of a certain dialect group, certain interests (ie wayang singing, musical instrument) and even by surname.
What i despise is some of the associations are formed primarily for gambling. Take a stroll along angsiang/club street and you can hear majong sounds almost 24/7.
Some clubs are really healthy and promotes makan sessions, frequent meets and even a time for festivals celebration.
Choose wisely and dont get involved in the club's politics. Do not expect the club to help one achieve unreasonable goals. However, through such networking, one's circle of friends can definitely get widened.
All I can say is, do not restrict such clubs to locality. One may find a great community to join at the heart of chinatown. Well, its about chemistry and shared interests.
Otherwise, go to a few country clubs to mingle with top executives and businessmen.
While i am not in my 70s, i am a committee for an aged old community club. I feel they are a happy bunch who gathers to chit chat. Gambling is out of the club's rules for these folks as the intent to gamble is evil at its core.