What a lot of fuss about nothing! To call a group "elderly" is not necessarily to dismiss or stereotype it any more than calling a group "young people" is. Both terms are vague in the extreme, e.g. young person can refer to someone who is a baby or to someone who is in their twenties or even thirties. Elderly refers to people who either are very old or who are, as Chambers puts it, "approaching old age" – another vast range of actual physical ages.
The article asks that we be called "older" but older is comparative so needs to be qualified with an explanation – older than what? Why, older than young people is all.
Nothing wrong with the terms kids, young adults, middle aged bods and the elderly as far as I'm concerned. It's all relative and, in particular, it's extremely vague and non-informative and therefore not worth taking any notice of.
<shrugs and moves on, not caring two hoots what age related category labelling people put her in>