Blaiming the so called shidduch crises on an alleged age gap can be compared to blaiming the so called unemployment crises on lack of job qualification.
There are always jobs for people who want to work, The job will perhaps not be the one that the candidate is ideally looking for, and maybe not the glamore or salary he seeks; but there is always a job available. And most times, working hard at this job will ultimately produce the desired results and satisfaction.
It’s same thing with shidduchin. There are lots of opportunities and candidates. They might not be the ideal person that one seeks, but by working on the marriage every day (which is required for all successful marriages); the marriage will be happy and successful.