73 years old here, last in a serious relationship in 1984. I got busy with a PhD program, took 10 years to finish (much due to several things I didn't know I had & were barriers to getting work done).
Doctorate (1994) took tons of work & time & energy & I barely looked for anyone at all. Tried a bit with the help of both pre- and post-internet dating. Nothing the least bit promising. No more than a couple of dates with each.
I decided in favor of permanent single-hood (unless someone perfectly fabulous chases me). The more years that have passed since that decision (circa year 2000), the happier I have been.