Nevertheless I will be dying my hair for my next job interview.
The thing is, if your resume says you graduated with a BSc in 1992, it's pretty obvious you were born around 1970.
It's not what you look like that's the problem. Anywhere discriminating against older people almost certainly has an unwritten company code of "you have to devote yourself to the job, be single and available to work weekends or nights when we say so". Older people are (a) more likely to have family and other important outside interests and (b) won't put up with the same deluded shit that wannabe hotshots will, as they've seen it all before.
Good point. That's why my graduation date is not on my resume.