health, when people say shidduch crisis, I don’t think they are talking about older previously married adults with kids who want or don’t want to get remarried. Or are you referring to older never married singles whose choices are limited since the divorcees/widowers of their age do not want to remarry? I don’t have any statistics, but I would guess that divorcees/widowers who want to remarry far outnumber those who don’t.
I would not use the word crisis to describe, say, widows in their 60s or more who would like to get remarried but can’t find anyone. Sad and lonely for them, yes, but not a communal crisis.