Thats pretty vague.
What do they like?
I am a parent, in my late 50's.
I like techno and punk rock, avante garde art, fuggazetta, the architecture at the zoo, choripan, the Pulgas, and military museums.
But I kinda doubt your parents have the same tastes as I do.
There are tons of cultural events, always- at all the CC's, like Recoleta or Borges, there are films, theater, dance, music, and art shows constantly.
Great museums in every barrio.
There are walking tours of the Recoleta Cemetery, or up to the top of Palacio Barolo.
http://www.pbarolo.com.ar/
Of course, some parents like Malls.