does EN software work for more than 5 years

You can check this yourself (just create a small dataset with some ages > 60 months and try to add indices).

Since EN (I think you mean "ENA for SMART") uses the WGS child growth reference it should cover the whole of the reference population. See http://www.who.int/childgrowth/en/. The W/H reference (e.g.) covers heights from 45 to 120 cm (these will usually cover children younger that 6 months and older than 5 years). The W/A child growth references is, however, limited to <= 5 years.

See here for the WGS standards for 5 - 19 years (BMI/A and H/A) and 5 - 10 years (W/A). The problem with older children is that anthropometric status is complicated to assess due to the pre-adolescent growth-spurt which shows considerable variation both within and between settings in terms of start age and duration and also by puberty. There is a set of macros / scripts than you can use to calculate indices fro older children using a range of common statistics applications.

I hope this helps.