(Rationale being retirement planning advisors encourage people to make the most of those first ten years (65 to 75) to do bucket-list things while (usually) they still can)
I feel like it's becoming a word describing people that have passed their prime (~35+ yo).
Yes, I'm fully aware that the word initially described people that were born during the baby boomer years (~1950) and that the people that are currently 35yo are millennials.
80 years ago was 1944 - not exactly a boom year. Most are 60-65-70 and would not consider themselves elderly. It's a very loaded word.
You go directly from middle aged to elderly, there isn't a step in between. Being elderly can cover a very wide range of years.
That said, I've had friends that were elderly in their mid thirties.. State of mind and all that.