Many years ago there was a limited demand for remote work, which probably tapered the supply, but in my experience from every 3 leads you followed (granted you had the experience), 2 were promising and 1 was almost always an offer. Now a days it's more like you need to follow 30 leads to get one 'meh' answer. I don't feel it's an age issue, it's just a general market condition.
With more companies acceptance of remote work, mixed in with the "we can't find local talent" mantra, the hiring process has turned more hands-off which in turn is producing these insane hiring procedures and cycles.
To make matters worse, everything from the smallest start-up to the largest tech company is adopting the same 'exclusive hiring practices' while they sit back wait for the resumes to roll in and/or send in work samples. All of this is hands-off trying to get candidates to 'fill slots' costs them next to nothing until the final phases. But for candidates it's just a time consuming PITA.
My only advice is to treat the process as any business transaction. Try to gauge how much they are invested in the hiring process, if they are asking you for hours or days on end while they appear to invest a couple of minutes of 'human time' RUN! These are lottery-like odds of landing an offer and unfortunatly this is endemic in large companies as well as unknown startups.
