When you look at Mexico from Europe there is an image of a young country, with high birth rates. But as in most countries in Latin America this is changing; a relevant economic growth (albeit not that well distributed) and the results of some policies have these countries in the midst of a demographic transition that can lead the in two decades to age pyramids much closer to the ones nowadays common in more northern countries. As of today, these are still rather young cities.
In central Mexico City the families in which the head (in the census sense) is 60 or over are clearly a minority (the orange grid is 2 km). The historical core around the Zócalo (A) has very few, just the opposite of most European historical cores. There are areas as colonia Jardín Balbuena (B) or Rincón del Bosque (D) which have high family incomes, where older family heads are more relevant. Colonia San Juan de Aragon (E) has also a relevant share, but their situation must be different, as this is not an affluent area. The Tlatelolco area (C), one of the high symbols of the Mexican social housing architecture, has a rather reduced presence of such aged family heads, even as its building years would be in many countries a pre-requisite for an aging population. Anyway, these results are limited to the age of the head of the family, so there can be more data to analyse.
It is striking to see the central areas as nearly the youngest ones.