Is there a "senior Olympic"?

Question

what is the qualification? and what are the venues? if it does exist, why it is so little known? shouldn't we promote this big time? so people would know the importance of exercise?

Answer 1

There are different organizations for older athletes.

World Masters Athletics, the WMA holds an indoor and outdoor world championships every two years, it is open to people 35 and older.

There are some other groups that also host championships for different sports.  

Answer 2

There is the Master games

at 30 you can enter